Updated on 2024/03/29

写真a

 
TANAKA, Masamitsu
 
Organization
Graduate School of Engineering Electronics 3 Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Electrical Engineering, Electronics, and Information Engineering
Title
Professor
External link

Degree 2

  1. Ph. D. ( 2006.3   Nagoya University ) 

  2. M. E. ( 2003.3   Nagoya University ) 

Research Interests 2

  1. Integrated Circuit Systems

  2. Superconductor Electronics

Research Areas 1

  1. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment  / Electronics

Current Research Project and SDGs 1

  1. Ultra high-speed, low-power electronics using superconductor

Research History 9

  1. Nagoya University   Department of Electronics, Graduate School of Engineering   Associate professor

    2022.10

  2. Nagoya University   Department of Electronics, Graduate School of Engineering   Assistant Professor

    2017.4 - 2022.9

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    Country:Japan

  3. Nagoya University   Department of Quantum Engineering Quantum, Graduate School of Engineering   Assistant Professor

    2016.7 - 2017.3

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    Country:Japan

  4. Nagoya University   PhD Professional Office   Designated lecturer

    2013.2 - 2016.6

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    Country:Japan

  5. Nagoya University   PhD Professional Office   Designated lecturer

    2012.12 - 2013.1

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    Country:Japan

  6. Nagoya University   Institute for Advanced Research   Designated assistant professor

    2010.7 - 2012.11

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    Country:Japan

  7. Nagoya University   Department of Information Engineering, Graduate School of Information Science   Designated assistant professor

    2009.4 - 2010.6

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    Country:Japan

  8. Nagoya University   Department of Information Engineering, Graduate School of Information Science   Researcher

    2007.4 - 2009.3

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    Country:Japan

  9. Japan Society for Promotion of Science   Researcher

    2005.4 - 2007.3

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Education 2

  1. Nagoya University   Graduate School, Division of Engineering   Information Engineering

    2003.4 - 2006.3

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    Country: Japan

  2. Nagoya University   Graduate School, Division of Engineering   Electronic Engineering

    2001.4 - 2003.3

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    Country: Japan

Professional Memberships 5

  1. Institute of Electrical Engineers of Japan   General Member

    2013.9

  2. Cryogenics and Superconductivity Society of Japan   Member

    2013.7

  3. Institute of Electrical and Electronics Engineers   Senior Member

    2005.1

  4. Japan Society of Applied Physics   Regular Member

    2004.1

  5. Institute of Electronics, Information and Communication Engineers   Member

    2002.4

Committee Memberships 10

  1. 電気学会ニューロモルフィック回路実装に向けたハードウェアに関する調査専門委員会   委員  

    2023.11 - 2025.10   

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    Committee type:Academic society

  2. Technical Committee on Metal and Ceramics, The Institute of Energy Economics, Japan   Committee Member  

    2023.2   

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    Committee type:Academic society

  3. IEEE Transactions on Applied Superconductivity Editorial Staff   Associate Editor  

    2020.6   

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    Committee type:Academic society

  4. Editorial Committee of the IEICE Transactions on Electronics   Associate Editor  

    2020.6 - 2026.6   

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    Committee type:Academic society

  5. Editorial Committee of the IEICE Electronics Express   Associate Editor  

    2020.6 - 2026.6   

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    Committee type:Academic society

  6. Editorial Committee of the IEICE Transactions on Electronics (Japanese Edition)   Associate Editor  

    2019.6 - 2025.6   

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    Committee type:Academic society

  7.   Member  

    2016   

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    Committee type:Academic society

  8. 電気学会量子コンピュータ周辺回路としての低温デジタル回路活用に関する調査専門委員会   幹事  

    2019.11 - 2021.10   

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    Committee type:Academic society

  9. 日本学術振興会超伝導エレクトロニクス第146委員会   幹事  

    2015.4 - 2023.3   

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    Committee type:Academic society

  10. 電気学会位相エンジニアリングに基づく低温エレクトロニクス調査専門委員会   幹事  

    2013.10 - 2016.9   

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    Committee type:Academic society

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Awards 5

  1. Awards for Science and Technology (Research Category), the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, 2023

    2023.4   Ministry of Education, Culture, Sports, Science and Technology  

    Akira Fujimaki and Masamitsu Tanaka

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    Award type:International academic award (Japan or overseas)  Country:Japan

  2. Design Contest Award Honorable Mention, The 23rd International Symposium on Low Power Electronics and Design (ISLPED)

    2017.7   The 23rd International Symposium on Low Power Electronics and Design (ISLPED)   1.6-mW, 56-GHz Arithmetic Logic Unit Based on Superconductor Single-Flux-Quantum Logic Circuit

    Masamitsu Tanaka, Ryo Sato, Yuki Hatanaka, Yuichi Matsui, Hiroyuki Akaike, Akira Fujimaki, Koki Ishida, Takatsugu Ono and Koji Inoue

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    Award type:Award from international society, conference, symposium, etc.  Country:Taiwan, Province of China

  3. 19th Superconductivity Science and Technology Award

    2015.4   Forum of Superconductivity Science and Technology, The Society of Non-Traditional Technology  

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    Country:Japan

  4. JSPS 146th Committee Award

    2015.4   The 146th Committee on Superconductive Electronics, The Japan Society for the Promotion of Science  

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    Country:Japan

  5. Excellent Presentation Award in 2014

    2014.5   Cryogenics and Superconductivity Society of Japan  

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    Country:Japan

 

Papers 58

  1. Flux transfer circuits breaking conventional limit in transfer coefficient based on a negative inductance of a π-junction Reviewed

    Masayuki Higashi, Feng Li, Masamitsu Tanaka and Akira Fujimaki

    Superconductor Science and Technology   Vol. 37 ( 4 ) page: 045003   2024.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-6668/ad2b79

  2. Inter-temperature bandwidth reduction in cryogenic QAOA machines Reviewed

    Yosuke Ueno, Yuna Tomida, Teruo Tanimoto, Masamitsu Tanaka, Yutaka Tabuchi, Koji Inoue, and Hiroshi Nakamura

    IEEE Computer Architecture Letters   Vol. 23 ( 1 ) page: 9 - 12   2023.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/LCA.2023.3322700

  3. Energy efficient half-flux-quantum circuit aiming at milli-kelvin stage operation Reviewed International journal

    F. Li, D. Pham, Y. Takeshita, M. Higashi, T. Yamashita, M. Tanaka, and A. Fujimaki

    Superconductor Science and Technology   Vol. 36 ( 10 ) page: 105006   2023.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-6668/acf0f2

  4. High-frequency operation of low-power single-flux-quantum circuits fabricated using 250 A/cm2 Nb/AlOx/Nb planarization process Reviewed

    Masamitsu Tanaka, Yoshihiro Kitagawa, Tetsuro Satoh, and Tsuyoshi Yamamoto

    2023 International Conference on IC Design and Technology (ICICDT)     page: 84 - 87   2023.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICICDT59917.2023.10332292

  5. Analysis of the effect of 0-π SQUIDs for enhancing mutual coupling Reviewed International journal

    Masayuki Higashi, Yuto Takeshita, Kento Kato, Hinata Fujisawa, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 5 ) page: 1600805   2023.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3249657

  6. Lowering Latency in a High-Speed Gate-Level-Pipelined Single Flux Quantum Datapath Using an Interleaved Register File Invited Reviewed International journal

    Ryota Kashima, Ikki Nagaoka, Tomoki Nakano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 5 ) page: 1303306   2023.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3249131

  7. Fabrication process for monolithic integration of a nitride superconductor-based superconducting qubit with a single flux quantum control circuit Reviewed International journal

    Shigeyuki Miyajima, Taro Yamashita, Masamitsu Tanaka, Naoki Takeuchi, Kunihiro Inomata, and Hirotaka Terai

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 5 ) page: 1100204   2023.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3241270

  8. Design and fabrication of low-power single-flux-quantum circuits toward quantum bit control Reviewed International journal

    Masamitsu Tanaka, Yoshihiro Kitagawa, Tetsuro Satoh, and Tsuyoshi Yamamoto

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 5 ) page: 1700805   2023.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3251304

  9. Optimization of half-flux-quantum circuits composed of π-shift and conventional Josephson junctions Reviewed International journal

    S. Tanemura, Y. Takeshita, F. Li, T. Nakayama, M. Tanaka, and A. Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 5 ) page: 1701305   2023.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3258374

  10. QIsim: Architecting 10+ K qubit QC interfaces toward quantum supremacy Reviewed International coauthorship

    D. Min, J. Kim, J. Choi, I. Byun, M. Tanaka, K. Inoue, and J. Kim

    Proceedings of the 50th Annual International Symposium on Computer Architecture (ISCA '23)     page: 1 - 16   2023.6

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1145/3579371.3589036

  11. Circuit designs for practical-scale fault-tolerant quantum computing Invited Reviewed

    Y. Suzuki, Y. Ueno, W. Liao, M. Tanaka, and T. Tanimoto

    2023 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)     page: 1 - 2   2023.6

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.23919/VLSITechnologyandCir57934.2023.10185351

  12. 50-GFLOPS floating-point adder and multiplier using gate-level-pipelined single-flux-quantum logic with frequency-increased clock distribution Reviewed International journal

    Ikki Nagaoka, Ryota Kashima, Masamitsu Tanaka, Satoshi Kawakami, Teruo Tanimoto, Taro Yamashita, Koji Inoue, and Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 4 ) page: 1302711   2023.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3250614

  13. Execution of stored programs by a rapid single-flux-quantum random-access-memory-embedded bit-serial microprocessor using 50-GHz clock frequency Reviewed International journal

    M. Tanaka, R. Sato, A. Fujimaki, K. Takagi, and N. Takagi

    Applied Physics Letters   Vol. 122 ( 19 ) page: 192601   2023.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/5.0148273

    Web of Science

  14. Superconductor digital circuits with π junctions alone Reviewed International journal

    F. Li, Y. Takeshita, M. Tanaka, and A. Fujimaki

    Applied Physics Letters   Vol. 122 ( 16 ) page: 162601   2023.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/5.0144604

  15. Direct observations of π-leaps of superconducting phase differences in π-junction-based SQUIDs Reviewed International journal

    Yuto Takeshita, Feng Li, Masayuki Higashi, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    Superconductor Science and Technology   Vol. 36 ( 4 ) page: 045004   2023.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-6668/acb38d

  16. A high-throughput multiply-accumulate unit with long feedback loop using low-voltage rapid single-flux quantum circuits Reviewed International journal

    Ikki Nagaoka, Ryota Kashima, Koki Ishida, Masamitsu Tanaka, Taro Yamashita, Takatsugu Ono, Koji Inoue, and Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 33 ( 3 ) page: 1301808   2023.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2023.3239329

  17. Interactive visualization of single flux quantum circuits, a device expected to be on board spacecraft Reviewed

      Vol. 12   page: 31 - 40   2023.2

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

    DOI: doi.org/10.20637/00049169

  18. A 57.2GHz 11.2mW 8-bit General Purpose Superconductor Microprocessor with Dual-Clocking Scheme Reviewed International journal

    Ikki Nagaoka, Ryota Kashima, Tomoki Nakano, Masamitsu Tanaka, Taro Yamashita, Koji Inoue, and Akira Fujimaki

    IEEE Asian Solid Circuits Conference (A-SSCC 2022)     2022.11

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/A-SSCC56115.2022.9980802

  19. XQsim: modeling cross-technology control processors for 10+K qubit quantum computers Reviewed International coauthorship International journal

    Ilkwon Byun, Junpyo Kim, Dongmoon Min, Ikki Nagaoka, Kosuke Fukumitsu, Iori Ishikawa, Teruo Tanimoto, Masamitsu Tanaka, Koji Inoue, and Jangwoo Kim

    49th Annual International Symposium on Computer Architecture (ISCA '22)     page: 366 - 382   2022.6

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1145/3470496.3527417

  20. Current Status and Issues of Superconductor Peripheral Circuits for Quantum Computers Reviewed

    Masamitsu Tanaka, Yuki Yamanashi

    IEEJ Transactions on Fundamentals and Materials   Vol. 142 ( 5 )   2022.5

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  21. Weak spin-flip scattering in Pd89Ni11 interlayer of NbN-based ferromagnetic Josephson junctions Reviewed International journal

    Duong Pham, Riku Sugimoto, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    Scientific Reports   Vol. 12 ( 1 ) page: 6863   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/s41598-022-10967-6

  22. QULATIS: A quantum error correction methodology toward lattice surgery Reviewed International journal

    Yosuke Ueno, Masaaki Kondo, Masamitsu Tanaka, Yasunari Suzuki, and Yutaka Tabuchi

    28th IEEE International Symposium on High-Performance Computer Architecture (HPCA-28)     page: 274 - 287   2022.4

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/HPCA53966.2022.00028

  23. QECOOL: On-Line Quantum Error Correction with a Superconducting Decoder for Surface Code Reviewed

    Y. Ueno, M. Kondo, M. Tanaka, Y. Suzuki, and Y. Tabuchi

    2021 58th ACM/IEEE Design Automation Conference (DAC)     page: 451 - 456   2021.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/DAC18074.2021.9586326

  24. Planarized Nb 4-Layer Fabrication Process for Superconducting Integrated Circuits and Its Fabricated Device Evaluation Reviewed International journal

    Shuichi Nagasawa, Masamitsu Tanaka, Naoki Takeuchi, Yuki Yamanashi, Shigeyuki Miyajima, Fumihiro China, Taiki Yamae, Koki Yamazaki, Yuta Somei, Naonori Sega, Yoshinao Mizugaki, Hiroaki Myoren, Hirotaka Terai, Mutsuo Hidaka, Nobuyuki Yoshikawa, Akira Fujimaki

    IEICE Transactions on Electronics   Vol. E104-C ( 9 ) page: 435 - 445   2021.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    We developed a Nb 4-layer process for fabricating superconducting integrated circuits that involves using caldera planarization to increase the flexibility and reliability of the fabrication process. We call this process the planarized high-speed standard process (PHSTP). Planarization enables us to flexibly adjust most of the Nb and SiO2 film thicknesses; we can select reduced film thicknesses to obtain larger mutual coupling depending on the application. It also reduces the risk of intra-layer shorts due to etching residues at the step-edge regions. We describe the detailed process flows of the planarization for the Josephson junction layer and the evaluation of devices fabricated with PHSTP. The results indicated no short defects or degradation in junction characteristics and good agreement between designed and measured inductances and resistances. We also developed single-flux-quantum (SFQ) and adiabatic quantum-flux-parametron (AQFP) logic cell libraries and tested circuits fabricated with PHSTP. We found that the designed circuits operated correctly. The SFQ shift-registers fabricated using PHSTP showed a high yield. Numerical simulation results indicate that the AQFP gates with increased mutual coupling by the planarized layer structure increase the maximum interconnect length between gates.

    DOI: 10.1587/transele.2020SUP0001

  25. Investigation of Timing Parameters in Single-Flux-Quantum Circuits Using Low Critical-Current Junctions and Low Bias Voltages Invited Reviewed International journal

    M. Kuniyoshi, K. Murase, I. Nagaoka, K. Sano, M. Tanaka, T. Yamashita, and A. Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 31 ( 5 ) page: 1101405   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2021.3067827

  26. Demonstration of a 52-GHz Bit-Parallel Multiplier Using Low-Voltage Rapid Single-Flux-Quantum Logic Invited Reviewed International journal

    I. Nagaoka, K. Ishida, M. Tanaka, K. Sano, T. Yamashita, T. Ono, K. Inoue, and A. Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 31 ( 5 ) page: 1302505   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2021.3071996

  27. High-Speed Memory Driven by SFQ Pulses Based on 0-π SQUID Reviewed International journal

    Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 31 ( 5 ) page: 1100906   2021.8

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    We propose a new cryogenic high-speed and low-power matrix memory required for achieving a high-performance superconductor computing system. The memory cell is based on the 0-π SQUID with conventional Josephson junctions (0-junctions) and a π-shifted ferromagnetic Josephson junction (π-junction). The memory state is stored in the form of two stable states in the 0-π SQUID. The π shift feature of the π-junction eliminates the need for any bias current or magnetic field for the formation of two states, i.e., the memory is non-volatile. In this memory, an impulse-shaped voltage signal generated in single-flux-quantum (SFQ) circuits is used for the write and read operations of the memory state. By using the pulses propagating in passive transmission lines, high-speed and low-power operation can be achieved because a recharging process determining the operation speed and the dominant energy consumption can be eliminated. We fabricated the 0-π SQUID-based pulse-driven memory cells with an SFQ driver. From the static characteristics, we confirmed that the current needed for rewriting can be sufficiently reduced. In addition, we successfully demonstrated the correct write operation in the memory cell by the SFQ pulse train transmitted from the SFQ driver via the passive transmission line.

    DOI: 10.1109/TASC.2021.3060351

  28. 64-GHz Datapath Demonstration for Bit-Parallel SFQ Microprocessors Based on a Gate-Level-Pipeline Structure Invited Reviewed International journal

    Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 31 ( 5 ) page: 1301006   2021.8

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    We successfully demonstrated an 8-bit-wide, bit-parallel datapath composed of an arithmetic logic unit and register files for high-throughput oriented SFQ microprocessors based on a gate-level-pipeline structure. Achieving high-speed operation in the bit-parallel datapath is difficult because of feedback paths. We used concurrent-flow clocking and counter-flow clocking in combination to solve the timing problem at the feedback path in the datapath, and we optimized the number of JJs and pipeline stages in the register file for solving the timing issue. We designed the datapath with the cell library for the AIST 10 kA/cm 2 Advanced Process. The total number of pipeline stages, Josephson junctions, and circuit area of the designed datapath were 52, 18448, and 3.81 mm × 4.05 mm, respectively. We obtained a relatively wide bias margin of the designed datapath at the target clock frequency of 50 GHz, and it operated up to 64 GHz in on-chip high-speed testing.

    DOI: 10.1109/TASC.2021.3061353

  29. Synchronous SFQ address encoder for superconductor detector arrays Reviewed International coauthorship International journal

    Ali Bozbey, Eren Can Aydogan, Kubra Usenmez, Sasan Razmkhah, Masamitsu Tanaka, Akira Fujimaki

    IEEE Transactions on Applied Superconductivity     2021.6

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    With the advances in superconductor detectors and single flux quantum (SFQ) logic circuits, megapixel imagers have become possible. Various detectors such as superconducting stripline detectors (SSLD), kinetic inductance detectors (KID), nanowire single-photon detectors have quite matured in terms of speed and performance. However, scaling of the read-out electronics is still a challenge. We propose an SFQ based synchronous address encoder to read-out the response of an SSLD array. The encoder circuit provides two sets of outputs at each clock period: one is the time-division multiplexed, serial data output, and the other is the synchronized address output associated with the time-multiplexed data. So, the number of connections to the room temperature is substantially reduced. We experimentally demonstrate a 2-bit encoder. Then we present the scalability of the circuit to larger arrays and show the simulation results of a 4-bit encoder which is suitable to read-out a 16x16 detector array.

    DOI: 10.1109/TASC.2021.3065000

  30. Superconductor Processor Architecture Reviewed

    Koji Inoue, Masamitsu Tanaka, Koki Ishida

    TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)   Vol. 56 ( 2 ) page: 87 - 93   2021.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Moore's Law, doubling the number of transistors in a chip every two years, has contributed to the evolution of computer system architectures to date. The growth of such hardware implementation makes many optimization opportunities available to software developers. Unfortunately, we cannot expect sustainable transistor shrinking anymore; that is, the end of Moore's Law will come. Although device and manufacturing technologies continue to progress, some researchers predict that transistor shrinking may stop around 2030 to 2035 due to physical or economic reasons. The goal of this research is to open the door for post-CMOS ultrahigh-performance, low-power computing. Our approach is based on device/circuit/architecture-level co-designs by targeting an emerging device called the single-flux quantum (SFQ). We have successfully demonstrated several outstanding physical designs supporting over 30 GHz. This paper summarizes our research outcomes and discusses the future direction of next-generation computer system architecture.

    DOI: 10.2221/jcsj.56.87

  31. Low-power high-speed half-flux-quantum circuits driven by low bias voltages Reviewed International journal

    Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    Superconductor Science and Technology   Vol. 34 ( 2 ) page: 025013   2021.2

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    Half-flux-quantum (HFQ) circuits store and propagate half-flux quanta. The basic circuit element is a 0-π SQUID, which is a superconducting quantum interference device with a conventional Josephson junction (0-junction) and a π-shifted ferromagnetic junction (π-junction). A 0-π SQUID achieves a small critical current in the absence of an external magnetic field, thus reducing power consumption. It is easy to set up 0-0-π SQUIDs with two 0-junctions and a π-junction which serves as a π phase-shifter. We simulated 0-0-π SQUID-based HFQ circuits driven by low bias voltages, referred to as LV-HFQ circuits. In these circuits, shunt resistors are not required for switching junctions because there is no hysteresis in the current–voltage characteristics of 0-0-π SQUIDs. We estimated the power consumption and maximum operating frequency of an HFQ Josephson transmission line based on 0-0-π SQUIDs. When operating at 43.5 GHz, the power dissipation of a single element composed of a 0-0-π SQUID and a bias resistor fell to about 0.165 nW when biased at 60 μV. The LV-HFQ circuit is potentially more power-efficient than all other currently available superconducting logic circuits.

    DOI: 10.1088/1361-6668/abcaac

  32. SFQ Parallel Encoders Promising for Video Imaging With Superconductor Stripline Detectors Reviewed International coauthorship International journal

    Masamitsu Tanaka, Misaki Kozaka, Kyohei Kamiya, Kübra Üsenmez, Eren Can Aydo ̆gan, Sasan Razmkhah, Ali Bozbey, Akira Fujimaki

    IEEE Transactions on Applied Superconductivity   Vol. 31 ( 1 ) page: 1300106   2021.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    We report demonstration of a readout circuit with high-throughput single flux quantum (SFQ) based encoders for a large-scale video imaging system with a conventional frame rate. The encoders are fully parallel and integrated on the same chip as linear arrays of serially connected superconductor stripline detectors (SSLDs), superconducting quantum interference device (SQUID) based comparators, and SFQ synchronizers. Mutual coupling of parallel SSLDs and SQUID-based comparators allows the use of only one dc bias line; it is possible to use thousands of SSLDs without increasing the bias current or number of bias ports. To achieve crosstalk-free readout, the serially connected SSLDs are separated by low-pass filters or large inductors. We experimentally demonstrated crosstalk-free readout including SFQ parallel encoders from 1-D or 2-D serially connected SSLD arrays.

    DOI: 10.1109/TASC.2020.3013385

  33. Investigation of Timing Parameters in Single-Flux-Quantum Circuits Using Low Critical-Current Junctions and Low Bias Voltages Reviewed International journal

    Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    IEEE Transactions on Applied Superconductivity     2021

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    Language:English   Publishing type:Research paper (scientific journal)  

    In this study, the trade-off among power consumptions, operating frequencies, and error rates in low-power single-flux-quantum (SFQ) circuit is investigated. The power consumption of SFQ circuits can be reduced by the lowering critical currents (Ic values) of the Josephson junctions (JJs), or the bias voltage (Vb). The shifts and spreads of timing parameter fluctuations when Ic and Vb were lowered were numerically analyzed, with consideration of thermal noise at 4.2 K. The timing behaviors after Ic was lowered were relatively simple, being based on the signal-to-noise ratio, whereas those for lowered Vb values were complicated because of the dynamic behaviors of JJs driven at reduced voltage. The simulation results imply that the operating frequencies decreased because the timing windows narrowed, but the highest energy efficiency was obtained when we lowered Ic or Vb to 6.25% of their conventional values, and the energy reduction after lowering of Vb was 26% better than that after lowering of Ic. Moreover, if a small error rate (for example 10-6) is acceptable, further improvement in energy efficiency would be expected at significantly higher clock frequencies than would be the case if the SFQ circuit must exhibit error-free operation.

    DOI: 10.1109/TASC.2021.3067827

  34. Demonstration of a 52-GHz Bit-Parallel Multiplier Using Low-Voltage Rapid Single-Flux-Quantum Logic Reviewed International journal

    Ikki Nagaoka, Koki Ishida, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Takatsugu Ono, Koji Inoue, Akira Fujimaki

    IEEE Transactions on Applied Superconductivity     2021

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  35. SuperNPU: An Extremely Fast Neural Processing Unit Using Superconducting Logic Devices Reviewed International coauthorship

    Koki Ishida, Ilkwon Byun, Ikki Nagaoka, Kosuke Fukumitsu, Masamitsu Tanaka, Satoshi Kawakami, Teruo Tanimoto, Takatsugu Ono, Jangwoo Kim, Koji Inoue

    2020 53rd Annual IEEE/ACM International Symposium on Microarchitecture (MICRO)     page: 58 - 72   2020.10

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    DOI: 10.1109/MICRO50266.2020.00018

  36. 32 GHz 6.5 mW Gate-Level-Pipelined 4-Bit Processor using Superconductor Single-Flux-Quantum Logic Reviewed International journal

    Koki Ishida, Masamitsu Tanaka, Ikki Nagaoka, Takatsugu Ono, Satoshi Kawakami, Teruo Tanimoto, Akira Fujimaki, Koji Inoue

    2020 IEEE Symposium on VLSI Circuits     2020.6

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    A Single-Flux-Quantum (SFQ) 4-bit throughput-oriented processor has successfully been demonstrated at up to 32 GHz with the measured power consumption of 6.5 mW. This is the first implementation of the gate-level-pipelined processor, and it achieves 2.5 Tera-Operations Per Watt (TOPS/W) by circuit and architectural optimizations.

    DOI: 10.1109/VLSICircuits18222.2020.9162826

  37. Where does device research go in Post Moore's Era?: An architecture perspective Reviewed

    Koji Inoue, Satoshi Kawakami, Masamitsu Tanaka

    The Journal of the Institute of Electronics, Information and Communication Engineers   Vol. 102 ( 10 ) page: 957-962   2019.10

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  38. Fundamental Study on the Nanocryotron Properties by the Numerical Calculation

    Inoue Masumi, Izaki Kazuki, Goto Yuki, Sano Kyosuke, Yamashita Taro, Tanaka Masamitsu, Fujimaki Akira

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 29 ( 5 )   2019.8

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    DOI: 10.1109/TASC.2019.2904585

    Web of Science

  39. A 48GHz 5.6mW Gate-Level-Pipelined Multiplier Using Single-Flux Quantum Logic Reviewed International journal

    Nagaoka Ikki, Tanaka Masamitsu, Inoue Koji, Fujimaki Akira

    2019 IEEE International Solid-State Circuits Conference (ISSCC)   Vol. 62   page: 460   2019.2

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    A multiplier based on superconductor single-flux-quantum (SFQ) logic is demonstrated up to 48GHz with the measured power consumption of 5.6 mW. The multiplier performs 8 × 8-bit signed multiplication every clock cycle. The design is based on a bit-parallel, gate-level-pipelined structure that exploits ultimately high-throughput performance of SFQ logic. The test chip fabricated using a 1.0-μm, 9-layer process consists of 20,251 Nb/AlOx/Nb Josephson junctions (JJs). The correctness of operation is verified by on-chip high-speed testing.

    DOI: 10.1109/ISSCC.2019.8662351

    Web of Science

  40. Magnetic Josephson Junctions on Nb Four-layer Structure for Half Flux Quantum Circuits

    Hasegawa Daiki, Takeshita Yuto, Sano Kyosuke, Tanaka Masamitsu, Fujimaki Akira, Yamashita Taro

    2019 IEEE INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC)     2019

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    Language:Japanese  

    Web of Science

  41. Demonstration of an Energy-Efficient, Gate-Level-Pipelined 100 TOPS/W Arithmetic Logic Unit Based on Low-Voltage Rapid Single-Flux-Quantum Logic

    Nagaoka Ikki, Tanaka Masamitsu, Sano Kyosuke, Yamashita Taro, Fujimaki Akira, Inoue Koji

    2019 IEEE INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC)     2019

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    Web of Science

  42. Design of Component Circuits for 50-GHz Bit-Parallel Microprocessors Based on Superconductor Single-Flux-Quantum Logic Invited Reviewed

    M. Tanaka, R. Sato, K. Ishida, Y. Hatanaka, Y. Matsui, T. Ono, K. Inoue, and A. Fujimaki

      Vol. 101-C ( 10 ) page: 389-399   2018.9

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  43. Energy/Space-Efficient Rapid Single-Flux-Quantum Circuits by Using pi-Shifted Josephson Junctions

    Kamiya Tomohiro, Tanaka Masamitsu, Sano Kyosuke, Fujimaki Akira

    IEICE TRANSACTIONS ON ELECTRONICS   Vol. E101C ( 5 ) page: 385-390   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transele.E101.C.385

    Web of Science

  44. Towards Ultra-High-Speed Cryogenic Single-Flux-Quantum Computing Invited Reviewed

    Ishida Koki, Tanaka Masamitsu, Ono Takatsugu, Inoue Koji

    IEICE Transactions on Electronics   Vol. E101C ( 5 ) page: 359-369   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transele.E101.C.359

    Web of Science

  45. Thermally Assisted Superconductor Transistors for Josephson-CMOS Hybrid Memories Invited Reviewed

    Sano Kyosuke, Suzuki Masato, Maruyama Kohei, Taniguchi Soya, Tanaka Masamitsu, Fujimaki Akira, Inoue Masumi, Yoshikawa Nobuyuki

    IEICE Transactions on Electronics   Vol. E101C ( 5 ) page: 370-377   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transele.E101.C.370

    Web of Science

  46. Trend and Perspective of Microprocessors Based on Single-flux-quantum Logic Reviewed

    Masamitsu Tanaka, Akira Fujimaki, Koji Inoue

    TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)   Vol. 52 ( 5 ) page: 323-331   2017.9

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    Authorship:Lead author   Language:Japanese  

    DOI: 10.2221/jcsj.52.323

  47. Investigation Into the Individual Configuration of Superconducting Phase Shift Elements Made of Ferromagnetic Patterns for Reconfigurable Circuits Reviewed

    Taniguchi Soya, Ito Hiroshi, Ishikawa Kouta, Kurokawa Sota, Tanaka Masamitsu, Akaike Hiroyuki, Fujimaki Akira

    IEEE Transactions on Applied Superconductivity   Vol. 27 ( 4 )   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2016.2642054

    Web of Science

  48. Josephson-CMOS Hybrid Memory With Nanocryotrons Reviewed

    Tanaka Masamitsu, Suzuki Masato, Konno Gen, Ito Yuki, Fujimaki Akira, Yoshikawa Nobuyuki

    IEEE Transactions on Applied Superconductivity   Vol. 27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2016.2646929

    Web of Science

  49. High-Speed Operation of Random-Access-Memory-Embedded Microprocessor With Minimal Instruction Set Architecture Based on Rapid Single-Flux-Quantum Logic Invited Reviewed

    Sato Ryo, Hatanaka Yuki, Ando Yuki, Tanaka Masamitsu, Fujimaki Akira, Takagi Kazuyoshi, Takagi Naofumi

    IEEE Transactions on Applied Superconductivity   Vol. 27 ( 4 ) page: 1300505   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2016.2642049

    Web of Science

  50. Exploring design space of a single-flux-quantum microprocessor Reviewed

    Koki Ishida, Masamitsu Tanaka, Takatsugu Ono, Koji Inoue

    Information Processing Society of Japan Journal   Vol. 58 ( 3 ) page: 629–643   2017.3

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  51. Functional switching in quantum-flux-parametron with ferromagnetic patterns Reviewed

    Hiroshi Ito, Soya Taniguchi, Sota Kurokawa, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    IEEJ Transactions on Fundamentals and Materials   Vol. 136 ( 12 ) page: 753-758   2016.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1541/ieejfms.136.753

  52. Development of an Optimizer for Vortex Transitional Memory Using Particle Swarm Optimization Invited Reviewed

    Karamuftuoglu Mustafa Altay, Demirhan Seda, Komura Yuto, Celik Mustafa Eren, Tanaka Masamitsu, Bozbey Ali, Fujimaki Akira

    IEEE Transactions on Applied Superconductivity   Vol. 26 ( 8 )   2016.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2016.2598761

    Web of Science

  53. Energy reduction in shunt-resistor-free low-voltage rapid single-flux-quantum circuits Reviewed

    Masamitsu Tanaka, Ryo Sato, Yuki Hatanaka, Akira Fujimaki

    IEEJ Transactions on Fundamentals and Materials   Vol. 136 ( 12 ) page: 740-746   2016.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1541/ieejfms.136.740

  54. High-Density Shift-Register-Based Rapid Single-Flux-Quantum Memory System for Bit-Serial Microprocessors Reviewed

    Tanaka Masamitsu, Sato Ryo, Hatanaka Yuki, Fujimaki Akira

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 26 ( 5 )   2016.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2016.2555905

    Web of Science

  55. Design and Demonstration of an 8-bit Bit-Serial RSFQ Microprocessor: CORE e4 Reviewed

    Ando Yuki, Sato Ryo, Tanaka Masamitsu, Takagi Kazuyoshi, Takagi Naofumi, Fujimaki Akira

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 26 ( 5 )   2016.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2016.2565609

    Web of Science

  56. High-Throughput Rapid Single-Flux-Quantum Circuit Implementations for Exponential and Logarithm Computation Using the Radix-2 Signed-Digit Representation Reviewed

    Tanaka Masamitsu, Takagi Kazuyoshi, Takagi Naofumi

    IEICE Transactions on Electronics   Vol. E99C ( 6 ) page: 703-709   2016.6

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transele.E99.C.703

    Web of Science

  57. Development of an Advanced Circuit Model for Superconducting Strip Line Detector Arrays Reviewed

    Bozbey Ali, Kita Yuma, Kamiya Kyohei, Kozaka Misaki, Tanaka Masamitsu, Ishida Takekazu, Fujimaki Akira

    IEICE TRANSACTIONS ON ELECTRONICS   Vol. E99C ( 6 ) page: 676-682   2016.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transele.E99.C.676

    Web of Science

  58. Rapid Single-Flux-Quantum Circuits Fabricated Using 20-kA/cm2 Nb/AlOx/Nb Process Reviewed

    Masamitsu Tanaka, Misaki Kozaka, Yuma Kita, Akira Fujimaki, Shuichi Nagasawa, Mutsuo Hidaka

    IEEE Trans. Appl. Supercond.   Vol. 25 ( 3 ) page: 1100304   2015.6

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TASC.2014.2365100

▼display all

MISC 3

  1. Superconductor Computing for Neural Networks Reviewed International coauthorship

    K. Ishida, I. Byun, I. Nagaoka, K. Fukumitsu, M. Tanaka, S. Kawakami, T. Tanimoto, T. Ono, J. Kim, K. Inoue

      Vol. 41 ( 3 ) page: 19 - 26   2021.4

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 10.1109/MM.2021.3070488

  2. QECOOL: On-Line Quantum Error Correction with a Superconducting Decoder for Surface Code

    Yosuke Ueno, Masaaki Kondo, Masamitsu Tanaka, Yasunari Suzuki, Yutaka Tabuchi

    arXiv:2103.14209 [quant-ph]     2020.3

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    Due to the low error tolerance of a qubit, detecting and correcting errors on it is essential for fault-tolerant quantum computing. Surface code (SC) associated with its decoding algorithm is one of the most promising quantum error correction (QEC) methods. % One of the challenges of QEC is its high complexity and computational demand. QEC needs to be very power-efficient since the power budget is limited inside of a dilution refrigerator for superconducting qubits by which one of the most successful quantum computers (QCs) is built. In this paper, we propose an online-QEC algorithm and its hardware implementation with SFQ-based superconducting digital circuits. We design a key building block of the proposed hardware with an SFQ cell library and evaluate it by the SPICE-level simulation. Each logic element is composed of about 3000 Josephson junctions and power consumption is about 2.78 uW when operating with 2 GHz clock frequency which meets the required decoding speed. Our decoder is simulated on a quantum error simulator for code distances 5 to 13 and achieves a 1.0% accuracy threshold.

  3. Extremely Energy-efficient Computing Based on Superconductor Reviewed

      Vol. 101 ( 12 ) page: 1207-1211   2018.12

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    Language:Japanese  

Presentations 250

  1. 量子ビット制御に向けた250 A/cm2プロセスによる低消費電力単一磁束量子回路の動作速度評価

    田中雅光, 北川佳廣, 佐藤哲朗, 山本剛

    第71回応用物理学会春季学術講演会  2024.3.22 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス(世田谷区)   Country:Japan  

  2. Superconducting diode based on asymmetric 3-JJs SQUID

    第71回応用物理学会春季学術講演会  2024.3.24 

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    Event date: 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス(世田谷区)   Country:Japan  

  3. πシフトジョセフソン接合を用いた単一磁束量子非破壊読み出しフリップフロップの動作実証

    出口創万, 上田伴春, 李峰, 田中雅光, 藤巻朗

    第71回応用物理学会春季学術講演会  2024.3.24 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス(世田谷区)   Country:Japan  

  4. 信号線の直接注入を用いたインパルス駆動型メモリセルの設計

    佐藤太一, 東正志, 李峰, 田中雅光, 藤巻朗

    第71回応用物理学会春季学術講演会  2024.3.24 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス(世田谷区)   Country:Japan  

  5. π接合を用いた磁束伝送回路の多段接続効果

    堀裕貴, 東正志, 李峰, 田中雅光, 藤巻朗

    第71回応用物理学会春季学術講演会  2024.3.24 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス(世田谷区)   Country:Japan  

  6. π接合を用いた磁束伝送回路における従来の限界を超える伝送係数の実証

    西崎海, 東正志, 森日向子, 李峰, 田中雅光, 藤巻朗

    第71回応用物理学会春季学術講演会  2024.3.24 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス(世田谷区)   Country:Japan  

  7. 半磁束量子を用いた高エネルギー効率情報処理回路

    田中雅光, 種村匠真, 中山彪之助, 東正志, 李峰, 藤巻朗

    2024年電子情報通信学会 総合大会  2024.3.5 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:広島大学東広島キャンパス(東広島市)   Country:Japan  

  8. π-SQUID の巨大インダクタンスを利用した単一磁束量子回路の検討

    森日向子, 東正志, 李峰, 田中雅光, 藤巻朗

    2024年電子情報通信学会 総合大会  2024.3.6 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学東広島キャンパス(東広島市)   Country:Japan  

  9. Demonstration of increased efficiency in signal transfer circuits caused by a negative inductance of a π-junction International conference

    A. Fujimaki, M. Higashi, H. Hori, H. Mori, F. Li, and M. Tanaka

    36th International Symposium on Superconductivity  2023.11.30 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:New Zealand  

  10. Low-power operation of half-flux-quantum circuits International conference

    M. Tanaka, S. Tanemura, T. Nakayama, M. Higashi, F. Li, and A. Fujimaki

    36th International Symposium on Superconductivity  2023.11.30 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:New Zealand  

  11. Demonstration of essential elements for realizing low-power half-flux-quantum circuits International conference

    T. Nakayama, S. Tanemura, M. Higashi, F. Li, M. Tanaka, and A. Fujimaki

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  12. Design, fabrication, and measurement setup of a capacitively shunted π-flux qubit controlled by a monolithic integrated SFQ circuit International conference

    D. Pham, T. Ueda, S. Miyajima, H. Terai, K. Inomata, M. Tanaka, A. Fujimaki, and T. Yamashita

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  13. Toward system-level optimization of superconducting quantum computers: the case of QAOA International conference

    Y. Ueno, Y. Tomida, T. Tanimoto, M. Tanaka, Y. Tabuchi, K. Inoue, and H. Nakamura

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  14. Integration process for 0 and π Josephson junctions into Nb four-layer devices International conference

    M. Hidaka, S. Nagasawa, K. Makise, H. Yamamori, T. Sato, and M. Tanaka

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  15. Fabrication process for superconducting devices based on nitride superconductors including ferromagnetic Josephson junction International conference

    S. Miyajima, H. Terai, T. Yamashita, D. Pham, M. Tanaka, and S. Miki

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  16. Detection of timing errors in SFQ circuits International conference

    P. Mundhe, K. Hiwaki, M. Tanaka, and K. Inoue

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  17. SFQ interface circuit for high-speed clock domain crossing International conference

    K. Hiwaki, M. Tanaka, F. Li, and A. Fujimaki

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  18. Impulse-driven memory cell with a directly coupled word line for reduction in footprint International conference

    T. Sato, M. Higashi, F. Li, M. Tanaka, and A. Fujimaki

    18th International Superconductive Electronics Conference (ISEC 2023) 

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    Event date: 2023.11

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  19. Logic and memory circuits based on π-junction-based SQUIDs International conference

    A. Fujimaki, F. Li, Y. Takeshita, S. Tanemura, T. Nakayama, and M. Tanaka

    18th International Superconductive Electronics Conference (ISEC 2023)  2023.11.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:China  

  20. Energy efficient half-flux-quantum circuit aiming at milli-kelvin stage operation International conference

    F. Li, D. Pham, Y. Takeshita, S. Tanemura, M. Higashi, T. Yamashita, M. Tanaka, and A. Fujimaki

    18th International Superconductive Electronics Conference (ISEC 2023)  2023.11.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  21. Superconducting Nb interconnects for cryo-CMOS and superconducting digital logic applications International conference

    H. Numata, N. Iguchi, M. Tanaka, K. Okamoto, S. Miura, K. Uchida, H. Ishikuro, T. Sakamoto, and M. Tada

    Advanced Metallization Conference 2023: Asian Session(ADMETA Plus 2023)  2023.10.12 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  22. π-SQUIDに基づく磁気結合素子の静的解析

    東正志, 森日向子, 李峰, 田中雅光, 藤巻朗

    第84回応用物理学会秋季学術講演会  2023.9.21 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本城ホールほか(熊本市)   Country:Japan  

  23. 窒化物系超伝導体に基づく磁性接合を含む集積回路プロセスの開発

    宮嶋茂之, 寺井弘高, 山下太郎, 田中雅光, 竹内尚輝, 三木茂人

    第84回応用物理学会秋季学術講演会  2023.9.21 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本城ホールほか(熊本市)   Country:Japan  

  24. Superconducting Full-wave Rectifier Using π-JJ-based Phase Shifter

    第84回応用物理学会秋季学術講演会  2023.9.21 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:熊本城ホールほか(熊本市)   Country:Japan  

  25. π-π-π SQUIDにおける共振ステップの観測

    堀裕貴, 李峰, 中山彪之助, 東正志, 田中雅光, 藤巻朗

    第84回応用物理学会秋季学術講演会  2023.9.21 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本城ホールほか(熊本市)   Country:Japan  

  26. π接合で構成した断熱量子磁束パラメトロンの検討

    藤村海斗, 田中雅光, 李峰, 藤巻朗

    2023年電子情報通信学会ソサイエティ大会  2023.9.15 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス(名古屋市)   Country:Japan  

  27. 多量子ビット制御に向けたNbNベース単一磁束量子スイッチ制御付き4出力分岐回路

    上田伴春, 宮嶋茂之, 寺井弘高, PhamDuong, 田中雅光, 山下太郎, 西村治道, 藤巻朗

    2023年電子情報通信学会ソサイエティ大会  2023.9.15 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス(名古屋市)   Country:Japan  

  28. 単一磁束量子回路に基づくリセット機能付きFIFO同期器の設計

    樋脇晃祐, 田中雅光, 李峰, 藤巻朗

    2023年電子情報通信学会ソサイエティ大会  2023.9.15 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス(名古屋市)   Country:Japan  

  29. 半磁束量子回路のD フリップフロップの動作実証

    種村匠真, 東正志, 中山彪之助, 李峰, 田中雅光, 藤巻朗

    2023年電子情報通信学会ソサイエティ大会  2023.9.15 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学東山キャンパス(名古屋市)   Country:Japan  

  30. Analysis of the AC response of single π-junction-SQUIDs International conference

    M. Higashi, F. Li, Y. Takeshita, M. Tanaka, and A. Fujimaki

    16th European Conference on Applied Superconductivity  2023.9.4 

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    Event date: 2023.9

    Language:English   Presentation type:Poster presentation  

    Country:Italy  

  31. Gate-level-pipeline SFQ circuits for high-throughput floating-point arithmetic International conference

    M. Tanaka, I. Nagaoka, R. Kashima, K. Hiwaki, S. Kawakami, T. Tanimoto, T. Ono, K. Inoue, T. Yamashita, and A. Fujimaki

    16th European Conference on Applied Superconductivity  2023.9.6 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  32. Field free superconducting diode effect with π-JJ-based arbitrary phase shifter International conference

    F. Li, T. Sato, H. Fujisawa, M. Higashi, Y. Takeshita, M. Tanaka, and A. Fujimaki

    16th European Conference on Applied Superconductivity  2023.9.6 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  33. Demonstration of impulse-driven memories with bias-free storage cells Invited International conference

    A. Fujimaki, Y. Takeshita, H. Fujisawa, T. Sato, M. Higashi, F. Li, and M. Tanaka

    16th European Conference on Applied Superconductivity  2023.9.5 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Italy  

  34. Evaluation of energy consumption and frequency in impulse-driven memories International conference

    T. Sato, H. Fujisawa, M. Higashi, Y. Takeshita, F. Li, M. Tanaka, and A. Fujimaki

    16th European Conference on Applied Superconductivity  2023.9.4 

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    Event date: 2023.9

    Language:English   Presentation type:Poster presentation  

    Country:Italy  

  35. 動特性を考慮したインパルス駆動型メモリセルの詳細設計

    佐藤太一, 藤澤日向, 東正志, 竹下雄登, 李峰, 田中雅光, 藤巻朗

    電子情報通信学会超伝導エレクトロニクス研究会  2023.8.8 

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    Event date: 2023.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学(横浜市)   Country:Japan  

  36. Analysis of the giant inductance effect in single π-junction-SQUIDs International conference

    Masayuki Higashi, Feng Li, Yuto Takeshita, Masamitsu Tanaka, and Akira Fujimaki

    11th East Asia Symposium on Superconductor Electronics (EASSE 2023)  2023.3.27 

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    Event date: 2023.3

    Language:English   Presentation type:Poster presentation  

    Venue:Okayama, Japan   Country:Japan  

  37. Impact of π-junction-based SQUIDs on superconductor circuits Invited International conference

    Akira Fujimaki, Yuto Takeshita, Masayuki Higashi, Hinata Fujisawa, Shoma Tanemura, Feng Li, and Masamitsu Tanaka

    11th East Asia Symposium on Superconductor Electronics (EASSE 2023)  2023.3.28 

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Okayama, Japan   Country:Japan  

  38. Design of half flux quantum circuits with controllability in energy efficiency International conference

    Toranosuke Nakayama, Yuto Takeshita, Feng Li, Shoma Tanemura, Masamitsu Tanaka, and Akira Fujimaki

    11th East Asia Symposium on Superconductor Electronics (EASSE 2023)  2023.3.27 

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    Event date: 2023.3

    Language:English   Presentation type:Poster presentation  

    Venue:Okayama, Japan   Country:Japan  

  39. Demonstration of a superconductor 8-bit microprocessor based on high-throughput single-flux-quantum logic circuits Invited International conference

    Masamitsu Tanaka, Ikki Nagaoka, Satoshi Kawakami, Teruo Tanimoto, Takatsugu Ono, Koji Inoue, and Akira Fujimaki

    11th East Asia Symposium on Superconductor Electronics (EASSE 2023)  2023.3.27 

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Okayama, Japan   Country:Japan  

  40. 0-0-π SQUIDの非対称性が半磁束量子回路に及ぼす影響

    中山彪之助, 堀裕貴, 竹下雄登, 李峰, 田中雅光, 藤巻朗

    第70回応用物理学会春季学術講演会  2023.3.16 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学(東京都千代田区)   Country:Japan  

  41. 微小信号領域におけるπ-SQUIDの巨大インダクタンスとしての挙動解析

    東正志, 竹下雄登, 李峰, 田中雅光, 藤巻朗

    第70回応用物理学会春季学術講演会  2023.3.16 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学(東京都千代田区)   Country:Japan  

  42. 半磁束量子回路の安定動作に向けた回路構成法に関する研究

    袁磊, 竹下雄登, 東正志, 中山彪之助, 李峰, 田中雅光, 藤巻朗

    第70回応用物理学会春季学術講演会  2023.3.16 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学(東京都千代田区)   Country:Japan  

  43. インパルス駆動型メモリの拡張性に関する検討

    佐藤太一, 藤澤日向, 竹下雄登, 李峰, 田中雅光, 藤巻朗

    第70回応用物理学会春季学術講演会  2023.3.16 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学(東京都千代田区)   Country:Japan  

  44. π-SQUIDに基づくインパルス駆動メモリセルの動作実証

    竹下雄登, 藤澤日向, 東正志, 李峰, 田中雅光, 藤巻朗

    第70回応用物理学会春季学術講演会  2023.3.16 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学(東京都千代田区)   Country:Japan  

  45. Superconducting diode using π-JJ-based arbitrary phase shifter

    Feng Li, Taichi Sato, Hinata Fujisawa, Yuto Takeshita, Masamitsu Tanaka, and Akira Fujimaki

    2023.3.16 

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  46. NbNジョセフソン接合による単一磁束量子回路の希釈冷凍機下における動作

    上田伴春, 中山彪之助, 宮嶋茂之, 寺井弘高, PHAM Duong, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会2023年総合大会  2023.3.10 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:芝浦工業大学(さいたま市)   Country:Japan  

  47. 半磁束量子回路のパラメータ設計指針

    種村匠真, 中山彪之助, 竹下雄登, LI Feng, 田中雅光, 藤巻朗

    電子情報通信学会2023年総合大会  2023.3.10 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:芝浦工業大学(さいたま市)   Country:Japan  

  48. A compact giant inductance device based on the negative flowing current across the ferromagnetic Josephson junction for superconducting electronics Invited International conference

    Feng Li, Masayuki Higashi, Yuto Takeshita, Masamitsu Tanaka, and Akira Fujimaki

    International Forum on Applied Superconductivity and Magnetism (IFASM Oceania 2022)  2022.12.1 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Gold Coast, Australia   Country:Australia  

  49. Half flux quantum circuit based on π-junctions Invited International conference

    Akira Fujimaki, Feng Li, Yuto Takeshita, Masayuki Higashi, and Masamitsu Tanaka

    35th International Symposium on Superconductivity (ISS 2022)  2022.12.7 

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    Event date: 2022.11 - 2022.12

    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Nagoya, Japan   Country:Japan  

  50. Analysis of the effect of 0-π SQUIDs for enhancing mutual coupling International conference

    Masayuki Higashi, Yuto Takeshita, Kento Kato, Hinata Fujisawa, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.26 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

    Venue:Hawaii, HI, USA   Country:United States  

  51. The power efficient half-flux-quantum circuits based on π-π-π SQUIDs aiming at the control of qubit circuits at 10 mK stage International conference

    Feng Li, Duong Pham, Yuto Takeshita, Masayuki Higashi, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.25 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

    Venue:Hawaii, HI, USA   Country:United States  

  52. Optimization of half flux quantum circuits composed of π-shift and conventional Josephson junctions International conference

    Shoma Tanemura, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.26 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

    Venue:Hawaii, HI, USA   Country:United States  

  53. NbN-based half-flux-quantum SQUID with hybrid structures of 0- and π-junctions International conference

    Taro Yamashita, Yuto Takeshita, Masamitsu Tanaka, Duong Pham, Shigeyuki Miyajima, Hirotaka Terai, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.27 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii, HI, USA   Country:United States  

  54. NbN-based half-flux-quantum circuits with superconductor/insulator/ferromagnet/superconductor junctions International conference

    Duong Pham, Riku Sugimoto, Kenjiro Oba, Feng Li, Yuto Takeshita, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.26 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii, HI, USA   Country:United States  

  55. Lowering latency in high-speed gate-level-pipelined single flux quantum datapath using interleaved register file Invited International conference

    Ryota Kashima, Ikki Nagaoka, Tomoki Nakano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.24 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Hawaii, HI, USA   Country:United States  

  56. Fabrication process for monolithic integration of nitride superconductor-based superconducting qubit with single flux quantum control circuit International conference

    Shigeyuki Miyajima, Taro Yamashita, Masamitsu Tanaka, Naoki Takeuchi, Kunihiro Inomata, and Hirotaka Terai

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.26 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

    Venue:Hawaii, HI, USA   Country:United States  

  57. Design and fabrication of extremely low-power single-flux-quantum circuits toward quantum bit control International conference

    Masamitsu Tanaka, Yoshihiro Kitagawa, Tetsuro Satoh, and Tsuyoshi Yamamoto

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.26 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii, HI, USA   Country:United States  

  58. Demonstration of selective access of impulse-driven, multi-bits memory based on 0-π SQUIDs International conference

    Yuto Takeshita, Hinata Fujisawa, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    2022 Applied Superconductivity Conference (ASC2022)  2022.10.27 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii, HI, USA   Country:United States  

  59. A giant inductance device based on the negative flowing current across the ferromagnetic Josephson junction for superconducting electronics International conference

    Feng Li, Masayuki Higashi, Yuto Takeshita, Masamitsu Tanaka, and Akira Fujimaki

    15th Superconducting SFQ VLSI Workshop (SSV 2022) / 4rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022)  2022.9.30 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan   Country:Japan  

  60. Recent progress in the development of NbN/PdNi/NbN π junctions for quantum circuits International conference

    Duong Pham, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki

    15th Superconducting SFQ VLSI Workshop (SSV 2022) / 4rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022)  2022.9.30 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan   Country:Japan  

  61. High-throughput single-flux-quantum circuits based on gate-level-pipelining toward artificial intelligence applications International conference

    Masamitsu Tanaka, Ikki Nagaoka, Satoshi Kawakami, Teruo Tanimoto, Takatsugu Ono, Koji Inoue, and Akira Fujimaki

    15th Superconducting SFQ VLSI Workshop (SSV 2022) / 4rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022)  2022.9.29 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan   Country:Japan  

  62. Demonstration of writing operation of 0-π-SQUID-based memory cells using only impulseshaped voltage pulses International conference

    Yuto Takeshita, Hinata Fujisawa, Masayuki Higashi, Feng Li, Masamitsu Tanaka, and Akira Fujimaki

    15th Superconducting SFQ VLSI Workshop (SSV 2022) / 4rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022)  2022.9.30 

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    Event date: 2022.9

    Language:English   Presentation type:Poster presentation  

    Venue:Kyoto, Japan   Country:Japan  

  63. Demonstration of non-destructive readout of impulse-driven memory cell based on 0-π squids International conference

    Hinata Fujisawa, Yuto Takeshita, Masayuki Higashi, Feng Li, Masamitsu Tanaka, and Akira Fujimaki

    15th Superconducting SFQ VLSI Workshop (SSV 2022) / 4rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022)  2022.9.30 

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    Event date: 2022.9

    Language:English   Presentation type:Poster presentation  

    Venue:Kyoto, Japan   Country:Japan  

  64. Analysis of single-π-junction SQUIDs acting as a giant inductance International conference

    Masayuki Higashi, Feng Li, Yuto Takeshita, Masamitsu Tanaka, and Akira Fujimaki

    15th Superconducting SFQ VLSI Workshop (SSV 2022) / 4rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022)  2022.9.30 

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    Event date: 2022.9

    Language:English   Presentation type:Poster presentation  

    Venue:Kyoto, Japan   Country:Japan  

  65. NbNベース半磁束量子回路の実現に向けたトグルフリップフロップ回路の作製

    大場絢次郎, PHAM Duong, 田中雅光, 山下太郎, 藤巻朗

    第83回応用物理学会秋季学術講演会  2022.9.22 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学(仙台市)   Country:Japan  

  66. SFIS磁性π接合に基づくアンシャントSFQ回路の特性評価

    李峰, 袁磊, 竹下雄登, 東正志, 田中雅光, 藤巻朗

    第83回応用物理学会秋季学術講演会  2022.9.22 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学(仙台市)   Country:Japan  

  67. 量子コンピュータに向けた超伝導ディジタル周辺回路 Invited

    田中雅光

    電子情報通信学会2022年ソサイエティ大会  2022.9.7 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  68. 半磁束量子回路の半磁束量子-電圧変換回路のパラメータ最適化

    種村匠真, 竹下雄登, 李峰, 田中雅光, 藤巻朗

    電子情報通信学会2022年ソサイエティ大会  2022.9.7 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  69. 量子ビットとのモノリシック実装に向けたNbNベース低電圧駆動単一磁束量子回路の設計

    上田伴春, 中山彪之助, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会2022年ソサイエティ大会  2022.9.7 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  70. 高い磁気結合を得るためのπ接合を用いたSQUIDの解析

    東正志, 竹下雄登, 藤澤日向, 李峰, 田中雅光, 藤巻朗

    電気情報通信学会超伝導エレクトロニクス研究会  2022.8.9 

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  71. π-π-π SQUIDs: The Switching Element of HFQ Circuits Operating at mK Invited

    F. Li, D. Pham, Y. Takeshita, K. Kato, M. Tanaka, T. Yamashita, A. Fujimaki

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Sagamihara and Online   Country:Japan  

  72. Demonstration of controlling the state of memory cell by impulse-signals

    Yuto Takeshita, Hinata Fujisawa, Kento Kato, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  73. Analysis of the SQUID based on π-junction for high magnetic permeability

    Masayuki Higashi, Yuto Takeshita, Kento Kato, Hinata Fujisawa, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  74. 170-GHz Operation of Single Flux Quantum Shift-Registers Using 25 kA/cm2 Nb/Al/AlOx/Al/Nb Junctions

    Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki, Kazumasa Makise, Shuichi Nagasawa, Mutsuo Hidaka

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  75. Design and fabrication of toggle flip-flop circuit with NbN-based half flux quantum

    Riku Sugimoto, Kenjiro Oba, Pham Duong, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  76. Design of NbN-Based, Extremely Low-Power Single-Flux-Quantum Circuits toward Monolithic Integration with Quantum Bits

    Toranosuke Nakayama, Tomoharu Ueda, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  77. Development of a fabrication process for superconducting integrated circuits based on nitride superconductors for qubit control

    Shigeyuki Miyajima, Taro Yamashita, Masamitsu Tanaka, Naoki Takeuchi, Hirotaka Terai

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  78. Design of Single Flux Quantum Circuits with Critical Current Density Process Lowered to 250 A/cm2 toward Quantum Bit Control

    Masamitsu Tanaka, Yoshihiro Kitagawa, Tetsuro Satoh, Tsuyoshi Yamamoto

    The 69nd Japan Society of Applied Physics Spring Meeting, 2022  2022.3.23 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sagamihara and Online   Country:Japan  

  79. Demonstration of Gate-Level-Pipelined Floating-Point Units Using Single-Flux-Quantum Circuits

    Ikki Nagaoka, Ryota Kashima, Masamitsu Tanaka, Satoshi Kawakami, Teruo Tanimoto, Taro Yamashita, Koji Inoue, Akira Fujimaki

    2022 IEICE General Conference  2022.3.16 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  80. Optimization of circuit parameters of half flux quantum circuits

    Shoma Tanemura, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2022 IEICE General Conference  2022.3.16 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  81. Design and Evaluation of Via Holes for Narrowed Passive Transmission Lines toward Area Reduction of Single-Flux-Quantum Circuits

    Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2022 IEICE General Conference  2022.3.16 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  82. Interactive Visualization of SFQ Transmission Line

    Akira Miura, Keiichi Matsuzaki, Takayuki Ishida, Masamitsu Tanaka, Koji Inoue

    2022 IEICE General Conference  2022.3.16 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  83. 宇宙機での利用に向けたデバイス開発に係る可視化 —単一磁束量子回路の例—

    三浦昭, 松崎恵一, 石田貴行, 田中雅光, 井上弘士

    2021年度宇宙科学情報解析シンポジウム  2022.2.17 

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    Event date: 2022.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  84. Half-flux-quantum circuits using π-shifted ferromagnetic junctions Invited International conference

    Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    34th International Symposium on Superconductivity (ISS2021)  2021.12.1 

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    Event date: 2021.11 - 2021.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Online   Country:Japan  

  85. π-phase shift in NbN-based Josephson junctions with weak ferromagnet Pd89Ni11 interlayer

    Duong Pham, Riku Sugimoto, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2021.11.15 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

  86. Pi-phase shift in NbN-based Josephson junctions with weak ferromagnet Pd89Ni11 interlayer

    D. Pham, R. Sugimoto, K. Oba, Y. Takeshita, F. Li, M. Tanaka, T. Yamashita, A. Fujimaki

    2021.11.15 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:online   Country:Japan  

  87. Superconducting Quantum Circuits toward Demonstration of Quantum Advantage in Simultaneous Quantum Messages Protocols International conference

    T. Yamashita, D. Pham, M. Tanaka, K. Inomata, and H. Nishimura

    The Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)  2021.11.10 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  88. Low-power Half-flux-quantum Circuits and the Fabrication Process Based on Ferromagnetic SFIS Josephson Junctions International conference

    F. Li, Y. Takeshita, D. Hasegawa, M. Tanaka, T. Yamashita, and A. Fujimaki

    The Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)  2021.11.9 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  89. Controlling Flexibility of Information Carrier Using Magnetic Josephson Junctions toward Highly Energy-Efficient Processing International conference

    M. Tanaka, M. Higashi, T. Yamashita, A. Fujimaki, K. Makise, and T. Ono

    The Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)  2021.11.10 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  90. Study on Pulse-Driven, Low Energy Consumption Memory Based on 0-π SQUIDs International conference

    Y. Takeshita, F. Li, H. Fujisawa, K. Kato, M. Higashi, M. Tanaka, T. Yamashita, and A. Fujimaki

    The Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)  2021.11.9 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  91. Pursuit of High-Speed Operation and Low Energy Consumption in Superconductor Logic Circuits International conference

    A. Fujimaki, F. Li, M. Tanaka, and T. Yamashita

    The Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)  2021.11.9 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  92. 単一磁束量子回路に基づくゲートレベルパイプライン浮動小数点演算器の設計

    長岡一起, 加島亮太, 田中雅光, 山下太郎, 川上哲志, 井上弘士, 藤巻朗

    2021年電子情報通信学会ソサイエティ大会  2021.9.16 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  93. アンシャント接合による加算器の高速化

    国吉真波, 長岡一起, 田中雅光, 山下太郎, 藤巻朗

    2021年電子情報通信学会ソサイエティ大会  2021.9.16 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  94. 低レイテンシ化を目的としたインターリーブ方式レジスタを伴う単一磁束量子データパスの動作実証

    加島亮太, 長岡一起, 中埜智貴, 田中雅光, 山下太郎, 藤巻朗

    2021年電子情報通信学会ソサイエティ大会  2021.9.16 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  95. 磁性ジョセフソン接合を用いたインパルス駆動型超伝導メモリセルの動作実証

    藤澤日向, 竹下雄登, 加藤健人, 東正志, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  96. インパルス駆動型マルチビットメモリの作製と実証

    竹下雄登, 藤澤日向, 加藤健人, 東正志, 李峰, 田中雅光, 山下太郎, 藤巻朗, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  97. 高透磁率を得るためのπ接合を用いた人工スピン系の提案

    東正志, 竹下雄登, 加藤健人, 藤澤日向, 李峰, 田中雅光, 山下太郎, 藤巻朗, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  98. 10kA/cm2プロセスを用いた単一磁束子100GHzビット並列加算器の実証

    中埜智貴, 長岡一起, 加島亮太, 田中雅光, 山下太郎, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  99. 半磁束量子を利用した小面積Tフリップフロップの解析

    中村, 祐介正志, 東正志, 竹下雄登, 李峰, 田中雅光, 山下太郎, 藤巻朗, 山下太郎, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  100. インパルス信号による超伝導マトリクスメモリの内部状態の読み出し

    加藤健人, 竹下雄登, 藤澤日向, 東正志, 李峰, 田中雅光, 山下太郎, 藤巻朗, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  101. 量子ビット応用に向けた絶縁層を含む強磁性ジョセフソン接合の開発

    大場絢次郎, PhamDuong, 杉本理駆, 田中雅光, 山下太郎, 藤巻朗, 田中雅光, 山下太郎, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  102. π-π-π SQUIDに基づく半磁束量子Tフリップフロップ

    李峰, 竹下雄登, 東正志, 田中雅光, 山下太郎, 藤巻朗

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  103. Demonstration of impulse-driven, high-speed memories based on 0-π SQUIDs International conference

    Y. Takeshita, H. Fujisawa, K. Kato, M. Higashi, F. Li, M. Tanaka, T. Yamashita, and A. Fujimaki

    15th European Conference on Applied Superconductivity (EUCAS 2021)  2021.9.5 

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    Event date: 2021.9

    Language:English   Presentation type:Poster presentation  

    Venue:Online  

  104. Demonstration of π-phase shift in NbN-based Josephson junctions with Pd89 Ni11 ferromagnetic interlayers International conference

    D. Pham, R. Sugimoto, K. Oba, Y. Takeshita, F. Li, M. Tanaka, T. Yamashita, and A. Fujimaki

    15th European Conference on Applied Superconductivity (EUCAS 2021)  2021.9.5 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online  

  105. Implementation of a High-Throughput Bit-Parallel Microprocessor Using Single-Flux-Quantum Logic Invited International conference

    I. Nagaoka, R. Kashima, T. Nakano, M. Tanaka, T. Yamashita, and A. Fujimaki

    15th European Conference on Applied Superconductivity (EUCAS 2021)  2021.9.5 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Online  

  106. Study on magnetic properties of π-junction-based artificial spin systems International conference

    M. Higashi, Y. Takeshita, K. Kato, H. Fujisawa, F. Li, M. Tanaka, T. Yamashita, and A. Fujimaki

    15th European Conference on Applied Superconductivity (EUCAS 2021)  2021.9.5 

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    Event date: 2021.9

    Language:English   Presentation type:Poster presentation  

    Venue:Online  

  107. Demonstration of Half-Flux-Quantum T-Flip Flops Made up with only π Junctions International conference

    F. Li, Y. Takeshita, K. Kato, M. Higashi, M. Tanaka, T. Yamashita, and A. Fujimaki

    15th European Conference on Applied Superconductivity (EUCAS 2021)  2021.9.5 

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    Event date: 2021.9

    Language:English   Presentation type:Poster presentation  

    Venue:Online  

  108. 磁場変調周期が半磁束量子となるSQUIDの評価

    竹下雄登, 東正志, 李峰, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会超伝導エレクトロニクス研究会  2021.8.6 

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    Event date: 2021.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  109. フィードバックパスを伴う単一磁束量子回路の高スループット・低レイテンシ化

    加島亮太, 長岡一起, 中埜智貴, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会超伝導エレクトロニクス研究会  2021.8.6 

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    Event date: 2021.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  110. 超伝導回路を用いた量子誤り訂正向け オンライン復号器の提案

    上野洋典, 近藤正章, 田中雅光, 鈴木泰成, 田渕豊

    情報処理学会第2回量子ソフトウェア研究発表会  2021.3.29 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  111. 超伝導ニューラルネットワーク・アクセラレータのアーキテクチャ探索を目的とした電力性能モデリング International coauthorship

    石田浩貴, IlkwonByun, 長岡一起, 福光孝介, 田中雅光, 川上哲志, 谷本輝夫, 小野貴継, 藤巻朗, JangwooKim, 井上弘士

    組込み技術とネットワークに関するワークショップ ETNET2021  2021.3.25 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  112. 磁性ジョセフソン接合を含むSQUIDによる半磁束量子単位変調

    竹下雄登, 加藤健人, 長谷川大輝, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第68回応用物理学会春季学術講演会  2021.3.18 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  113. 半磁束量子-単一磁束量子変換回路の実証

    中村祐介, 長谷川大輝, 竹下雄登, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第68回応用物理学会春季学術講演会  2021.3.18 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  114. パルス駆動型超伝導マトリクスメモリにおけるセル選択に関する研究

    加藤健人, 竹下雄登, 東正志, 長谷川大輝, 藤澤日向, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第68回応用物理学会春季学術講演会  2021.3.18 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  115. パルス駆動型メモリの実現に向けた低電流で駆動可能なメモリセルの設計と評価

    藤澤日向, 竹下雄登, 加藤健人, 東正志, 長谷川大輝, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第68回応用物理学会春季学術講演会  2021.3.18 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  116. NbN/PdNi/NbN 接合におけるジョセフソン臨界電流の強磁性膜厚依存性

    杉本理駆, PhamDuong, 中村颯, 田中雅光, 山下太郎, 藤巻朗

    第68回応用物理学会春季学術講演会  2021.3.18 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  117. SFQアニーラに向けた単一のスピン素子の特性評価

    東正志, 長谷川大輝, 竹下雄登, 加藤健人, 藤澤日向, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第68回応用物理学会春季学術講演会  2021.3.18 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  118. NbN-based Josephson junction with PdNi-ferromagnetic barrier International conference

    Duong Pham, Riku Sugimoto, Hayate Nakamura, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki, Yasunobu Nakamura

    American Physical Society (APS) March Meeting 2021  2021.3.18 

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    Event date: 2021.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  119. アンシャント接合によるSFQ論理ゲートのエネルギー効率の向上

    国吉真波, 長岡一起, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会2021年総合大会  2021.3.9 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  120. 単一磁束量子回路に基づく 50GHzビット並列演算マイクロプロセッサの設計

    長岡一起, 加島亮太, 中埜智貴, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会2021年総合大会  2021.3.9 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  121. 単一磁束量子回路の高集積化へ向けた細線受動伝送線路の評価

    加島亮太, 長岡一起, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会2021年総合大会  2021.3.9 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  122. 低消費電力単一磁束量子回路の動作周波数の調査

    国吉真波, 村瀬健, 長岡一起, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会超伝導エレクトロニクス研究会  2021.1.18 

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    Event date: 2021.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  123. Study on superconductor low-energy particle detectors for measurement of angular correlation between neutrino and electron in beta decay

    Masamitsu Tanaka and Masaaki Kitaguchi

    2020.12.22 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (general)  

  124. Quantum error correction with a superconducting decoder International conference

    Yosuke Ueno, Masaaki Kondo, Masamitsu Tanaka, Yasunari Suzuki, Yutaka Tabuchi

    2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)  2020.12.15 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  125. Extremely energy-efficient processing using superconductor circuits near physical limits International conference

    Masamitsu Tanaka, Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Taro Yamashita, Akira Fujimaki

    2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)  2020.12.15 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  126. Study on pulse-driven, high-speed memory based on 0-π SQUIDs with passive transmission lines International conference

    Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.10.28 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  127. 50-GHz datapath for parallel SFQ microprocessors based on gate-level-pipeline architecture Invited International conference

    Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.5 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Online   Country:United States  

  128. Demonstration of π-junction-based SQUIDs with half-flux-quantum modulation periods for energy-efficient circuits International conference

    Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.4 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  129. Investigation of timing parameters in single flux quantum circuits using low critical current junctions and low bias voltages International conference

    Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.4 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  130. High-density routing with wire length matching for single-flux-quantum circuits using thin passive transmission lines International conference

    Kei Kitamura, Masamitsu Tanaka, Takahiro Kawaguchi, Ikki Nagaoka, Kazuyoshi Takagi, Akira Fujimaki, Naofumi Takagi

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.4 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  131. Analysis on half flux quantum circuits formed with π and conventional Josephson junctions International conference

    Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.4 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  132. Study on the nanocryotron switching behavior by the numerical calculation International conference

    Masumi Inoue, Ikumi Miyazaki, Kazuki Izaki, Kyosuke Sano, Taro Yamashita, Masamitsu Tanaka, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.3 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  133. Demonstration of a 52-GHz, energy-efficient, bit-parallel multiplier using low-voltage rapid single-flux-quantum logic International conference

    Ikki Nagaoka, Koki Ishida, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Takatsugu Ono, Koji Inoue, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.11.2 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  134. Proposal of SFQ annealer using π-junction-based SQUIDs operating at 4 k International conference

    Masashi Higashi, Daiki Hasegawa, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki

    2020 Applied Superconductivity Conference (ASC 2020)  2020.10.30 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  135. 単一磁束量子回路に基づく並列処理データパスの 64GHz動作実証

    加島亮太, 長岡一起, 田中雅光, 山下太郎, 藤巻朗

    2020年電子情報通信学会ソサイエティ大会  2020.9.17 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  136. フィードバックループを含む単一磁束量子回路の高周波設計に向けたカウンターフロー方式シフトレジスタのタイミング解析

    長岡一起, 加島亮太, 田中雅光, 山下太郎, 藤巻朗

    2020年電子情報通信学会ソサイエティ大会  2020.9.17 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  137. 低消費電力単一磁束量子回路における論理ゲートのタイミングパラメータ解析

    国吉真波, 長岡一起, 田中雅光, 山下太郎, 藤巻朗

    2020年電子情報通信学会ソサイエティ大会  2020.9.17 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  138. 半磁束量子回路の実現に向けた基本素子の作製

    長谷川大輝, 加藤健人, 東正志, 竹下雄登, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第81回応用物理学会秋季学術講演会  2020.9.8 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  139. SFQパルス駆動型超伝導メモリ実現に向けたメモリセルの静特性評価

    竹下雄登, 李峰, 長谷川大輝, 加藤健人, 田中雅光, 山下太郎, 藤巻朗

    第81回応用物理学会秋季学術講演会  2020.9.8 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  140. 広帯域配線を備えた超伝導デジタル回路用冷凍機システムの特性評価

    村瀬健, 藤巻朗, 山下太郎, 田中雅光, 佐野京佑

    第81回応用物理学会秋季学術講演会  2020.9.8 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  141. SFQアニーラにおける隣接するスピン間の相互作用の影響

    東正志, 長谷川大輝, 竹下雄登, 李峰, 田中雅光, 山下太郎, 藤巻朗

    第81回応用物理学会秋季学術講演会  2020.9.8 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  142. π位相シフタに向けたコバルト障壁層をもつ強磁性ジョセフソン接合の作製と評価

    中村颯, 杉本理駆, PhamDuong, 田中雅光, 山下太郎, 藤巻朗

    第81回応用物理学会秋季学術講演会  2020.9.8 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  143. 単一磁束量子回路に基づく50 GHz並列処理データパスの設計

    加島亮太, 長岡一起, 田中雅光, 佐野京佑, 山下太郎, 藤巻朗

    電子情報通信学会2020年総合大会  2020.3.18 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  144. 単一磁束量子回路に基づく低電圧駆動ゲートレベルパイプライン算術論理演算器の設計と評価

    長岡一起, 田中雅光, 佐野京佑, 山下太郎, 井上弘士, 藤巻朗

    電子情報通信学会2020年総合大会  2020.3.18 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  145. 低電圧駆動単一磁束量子回路における論理ゲートのタイミングパラメータの解析

    国吉真波, 村瀬健, 長岡一起, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗

    電子情報通信学会2020年総合大会  2020.3.18 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  146. 超伝導受動線路を用いたパルス駆動型超伝導メモリの開発

    竹下雄登, 長谷川大輝, 李峰, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗

    第67回応用物理学会春季学術講演会  2020.3.13 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  147. 接合付加による半磁束量子回路の低消費エネルギー化

    藤巻朗, 李峰, 竹下雄登, 長谷川大輝, 佐野京佑, 田中雅光, 山下太郎

    第67回応用物理学会春季学術講演会  2020.3.14 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  148. 半磁束量子回路の実証に向けた動作解析

    長谷川大輝, 竹下雄登, 李峰, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗

    第67回応用物理学会春季学術講演会  2020.3.14 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  149. 4.2Kで動作するSFQアニーラに向けたπ接合を用いたSQUIDの解析

    東正志, 長谷川大輝, 竹下雄登, LiFeng, 田中雅光, 山下太郎, 藤巻朗

    第67回応用物理学会春季学術講演会  2020.3.14 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  150. コバルト障壁層をもつ強磁性ジョセフソン接合の作製と評価

    中村颯, 加藤悠輝, 田中雅光, 山下太郎, 藤巻朗

    第67回応用物理学会春季学術講演会  2020.3.14 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  151. Development of gate-level-pipelined SFQ circuits toward ultra-high-speed cryogenic computing Invited International conference

    Masamitsu Tanaka, Ikki Nagaoka, Koki Ishida, Kyosuke Sano, Taro Yamashita, Takatsugu Ono, Koji Inoue, Akira Fujimaki

    13th Superconducting SFQ VLSI Workshop (SSV 2020) 

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    Event date: 2020.1

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Yokohama, Japan   Country:Japan  

  152. Development of 50-GHz, high-throughput rapid single-flux-quantum circuits toward ultra-fast, energy-efficient computing Invited International conference

    Masamitsu Tanaka, Ikki Nagaoka, Kyosuke Sano, Taro Yamashita, Koki Ishida, Takatsugu Ono, Koji Inoue, Akira Fujimaki

    10th Asian Conference on Applied Superconductivity and Cryogenics (ACASC), 2nd International Cryogenic Materials Conference in Asia (Asian-ICMC), and CSSJ Joint Conference 

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    Event date: 2020.1

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Okinawa, Japan   Country:Japan  

  153. 単一磁束量子回路の現状と将来展望 ~高速性と低エネルギー性を如何に両立するか~

    田中雅光

    応用物理学会超伝導分科会第60回研究会 

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    Event date: 2019.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  154. π-shifted SQUID based circuits and applications for classical computing and beyond International conference

    Masamitsu Tanaka, Yuto Takeshita, Daiki Hasegawa, Feng Li, Kyosuke Sano, Taro Yamashita, Akira Fujimaki

    1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2019) 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  155. Study on superconductor nano-structured line drivers in random access memories

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    Event date: 2019.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  156. Numerical analysis of low-power logic family based on half flux quantum using π-shifted Josephson junctions International conference

    Masamitsu Tanaka, Tomohiro Kamiya, Yuto Takeshita, Yuta Yoshinomoto, Daiki Hasegawa, Kyosuke Sano, Taro Yamashita, Akira Fujimaki

    17th International Superconductive Electronics Conference (ISEC 2019) 

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    Event date: 2019.7

    Language:English   Presentation type:Poster presentation  

    Venue:Riverside, CA, USA   Country:United States  

  157. 単一磁束量子回路に基づくゲートレベル・パイプライン算術論理演算器の高エネルギー効率化と0.3mW, 30GHz動作実証

    田中雅光, 長岡一起, 石田浩貴, 佐野京佑, 山下太郎, 小野貴継, 井上弘士, 藤巻朗

    2019年並列/分散/協調処理に関する『北見』サマー・ワークショップ(SWoPP2019) 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北見   Country:Japan  

  158. Study on superconductor low-energy particle detectors for measurement of angular correlation between neutrino and electron in beta decay

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    Event date: 2019.6

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  159. High-speed operation of datapath for bit-parallel single-flux-quantum microprocessors

    Yuki Hatanaka, Ikki Nagaoka, Yuichi Matsui, Koki Ishida, Kyosuke Sano, Masamitsu Tanaka, Takatsugu Ono, Koji Inoue, Akira Fujimaki

    2016 IEICE General Conference 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  160. Design of superconducting digital circuits composed of π-shifted Josephson junctions

    Tomohiro Kamiya, Soya Taniguchi, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    The 65th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  161. Design and fabrication of ferromagnetic matrix memory and readout circuit with adiabatic quantum flux parametrons

    Hayato Iwashita, Soya Taniguchi, Haruki Kato, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    The 65th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  162. Fabrication of nanocryotron and evaluation of the static characteristics

    Kyohei Maruyama, Masato Suzuki, Kyosuke Sano, Taro Yamashita, Masamitsu Tanaka, Ali Bozbey, Akira Fujimaki, Masumi Inoue

    The 65th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  163. Superconducting phase engineering in flux-quantum-based circuits for higher performances

    Akira Fujimaki, Soya Taniguchi, Masamitsu Tanaka

    2018 Annual Meeting of the IEEJ 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  164. Power conversion efficiency of superconductor rectifier International conference

    Soya Taniguchi, Haruki Kato, Tomohiro Kamiya, Hayato Iwashita, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    11th Superconducting SFQ VLSI Workshop (SSV 2018) / 6th CRAVITY Symposium 

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    Event date: 2018.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tsukuba   Country:Japan  

  165. AQFP readout for ferromagnetic matrix memory International conference

    Hayato Iwashita, Soya Taniguchi, Haruki Kato, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    11th Superconducting SFQ VLSI Workshop (SSV 2018) / 6th CRAVITY Symposium 

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    Event date: 2018.2

    Language:English   Presentation type:Poster presentation  

    Venue:Tsukuba   Country:Japan  

  166. Study on operation principle of nanocryotrons International conference

    Kyohei Maruyama, Masato Suzuki, Naoki Kondo, Kyosuke Sano, Masamitsu Tanaka, Masumi Inoue, Akira Fujimaki

    11th Superconducting SFQ VLSI Workshop (SSV 2018) / 6th CRAVITY Symposium 

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    Event date: 2018.2

    Language:English   Presentation type:Poster presentation  

    Venue:Tsukuba   Country:Japan  

  167. Study on magnetically-controlled delay time in Josephson transmission lines International conference

    Yuichi Matsui, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    11th Superconducting SFQ VLSI Workshop (SSV 2018) / 6th CRAVITY Symposium 

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    Event date: 2018.2

    Language:English   Presentation type:Poster presentation  

    Venue:Tsukuba   Country:Japan  

  168. Low-power half single flux quantum circuits using π-shifted Josephson junctions International conference

    Tomohiro Kamiya, Soya Taniguchi, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    11th Superconducting SFQ VLSI Workshop (SSV 2018) / 6th CRAVITY Symposium 

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    Event date: 2018.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tsukuba   Country:Japan  

  169. Study on nano-structured devices based on pseudo-two-dimensional superconductors

    Kyosuke Sano, Masato Suzuki, Kyohei Maruyama, Masamitsu Tanaka, Akira Fujimaki, Masumi Inoue

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    Event date: 2018.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  170. Study on power-efficient driving of single flux quantum circuits with superconducting rectifiers

    Haruki Kato, Soya Taniguchi, Tomohiro Kamiya, Hayato Iwashita, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

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    Event date: 2018.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  171. Numerical analysis of rapid single-flux-quantum circuits composed of 0- and π-shifted Josephson junctions International conference

    Tomohiro Kamiya, Soya Taniguchi, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    30th International Symposium on Superconductivity (ISS2017) 

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    Event date: 2017.12

    Language:English   Presentation type:Poster presentation  

    Venue:Tokyo   Country:Japan  

  172. Cryogenic Digital Electronics --Challenges for Practical Use-- Invited International conference

    Akira Fujimaki, Masamitsu Tanaka

    30th International Symposium on Superconductivity (ISS2017) 

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    Event date: 2017.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Tokyo   Country:Japan  

  173. Execution of stored programs in a single­flux­quantum microprocessor with embedded memories at 50 GHz Invited International conference

    Akira Fujimaki, Ryo Sato, Yuki Hatanaka, Yuichi Matsui, Kazuyoshi Takagi, Naofumi Takagi, Masamitsu Tanaka

    13th European Conference on Applied Superconductivity (EUCAS 2017) 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Geneva   Country:Switzerland  

  174. Design and evaluation of datapath for bit-parallel single-flux-quantum microprocessors

    Yuki Hatanaka, Yuichi Matsui, Masamitsu Tanaka, Kyosuke Sano, Akira Fujimaki, Koki Ishida, Takatsugu Ono, Koji Inoue

    2017 IEICE Society Conference 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  175. Register file for bit-parallel single-flux-quantum microprocessors

    Yuichi Matsui, Yuki Hatanaka, Masamitsu Tanaka, Kyosuke Sano, Akira Fujimaki, Koki Ishida, Takatsugu Ono, Koji Inoue

    2017 IEICE Society Conference 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  176. Towards to ultra high-speed single-flux-quantum computing International conference

    Koji Inoue, Masamitsu Tanaka

    Arm Research Summit 2017 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Cambridge   Country:United Kingdom  

  177. Evaluation of characteristics of nano-cryotrons based on NbTiN thin films

    Masato Suzuki, Kyohei Maruyama, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki, Masumi Inoue

    The 78th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  178. Development of superconducting rectifiers based on ferromagnets for superconducting digital circuits

    Soya Taniguchi, Tomohiro Kamiya, Hayato Iwashita, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

    The 78th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  179. Thickness dependence of resistivity in NbN thin films

    Yoshito Sakakibara, Kyosuke Sano, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 78th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  180. Demonstration of 4-input lookup table based on single-flux-quantum circuits with ferromagnets

    Hayato Iwashita, Soya Taniguchi, Masamitsu Tanaka, Akira Fujimaki

    The 78th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  181. Study on the thermally-assisted nanostructure device model including the heat diffusion effect

    Kyosuke Sano, Masato Suzuki, Kyohei Maruyama, Masamitsu Tanaka, Akira Fujimaki, Masumi Inoue

    The 78th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  182. Fabrication and evaluation of superconducting thermally-assisted nano-structured transistors using NbTiN thin films

    Kyosuke Sano, Masato Suzuki, Kyohei Maruyama, Masamitsu Tanaka, Akira Fujimaki

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    Event date: 2017.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Iwaki   Country:Japan  

  183. Superconducting rectifiers based on residual magnetization of ferromagnetic patterns

    Soya Taniguchi, Hayato Iwashita, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki

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    Event date: 2017.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Iwaki   Country:Japan  

  184. Monolithic image sensor chips with highly sensitive single-flux-quantum readout circuits International conference

    Akira Fujimaki, Kyohei Kamiya, Hayato Iwashita, Masamitsu Tanaka, Ali Bozbey

    16th International Superconductive Electronics Conference (ISEC 2017) 

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    Event date: 2017.6

    Language:English   Presentation type:Poster presentation  

    Venue:Sorrento   Country:Italy  

  185. High-throughput bit-parallel arithmetic logic unit using rapid single-flux-quantum logic International conference

    Masamitsu Tanaka, Ryo Sato, Yuki Hatanaka, Yuichi Matsui, Hiroyuki Akaike, Akira Fujimaki, Koki Ishida, Takatsugu Ono, Koji Inoue

    16th International Superconductive Electronics Conference (ISEC 2017) 

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    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sorrento   Country:Italy  

  186. Impact of recent advancement in cryogenic circuit technology Invited International conference

    Akira Fujimaki, Masamitsu Tanaka

    16th International Superconductive Electronics Conference (ISEC 2017) 

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    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Sorrento   Country:Italy  

  187. Demonstration of a compact look-up table based on superconducting phase shift elements using ferromagnetic patterns International conference

    Soya Taniguchi, Hiroshi Ito, Takuya Kurihara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    16th International Superconductive Electronics Conference (ISEC 2017) 

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    Event date: 2017.6

    Language:English   Presentation type:Poster presentation  

    Venue:Sorrento   Country:Italy  

  188. Fabrication of thermally-assisted nanostructured devices using NbTiN thin films

    Masamitsu Tanaka, Masato Suzuki, Kyohei Maruyama, Kyosuke Sano, Hiroyuki Akaike, Akira Fujimaki

    94th Cryogenics and Superconductivity Society of Japan Conference (2017 Spring) 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  189. Bit-parallel arithmetic logical unit for 50-GHz operation using single flux quantum

    Ryo Sato, Yuki Hatanaka, Yuichi Matsui, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki, Koji Inoue

    2017 IEICE General Conference 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  190. Narrowed superconductor passive transmission lines with the advanced process

    Yuki Hatanaka, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    2017 IEICE General Conference 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya   Country:Japan  

  191. High-speed demonstration of look-up table based on SFQ circuit with ferromagnets

    Soya Taniguchi, Hiroshi Ito, Takuya Kurihara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 64th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Yokohama   Country:Japan  

  192. Preparation of nano-structure cmos driver based on NbTiN thin films

    Masato Suzuki, Kohei Maruyama, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 64th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Yokohama   Country:Japan  

  193. Evaluation of readout circuits in superconducting strip line detector

    Hayato Iwashita, Kyohei Kamiya, Masamitsu Tanaka, Ali Bozbey, Hiroyuki Akaike, Akira Fujimaki

    The 64th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Yokohama   Country:Japan  

  194. Evaluation of high-frequency operation of single-flux-quantum microprocessor with minimal instruction set architecture for executing programs, CORE e2

    Ryo Sato, Masamitsu Tanaka, Yuki Hatanaka, Hiroyuki Akaike, Akira Fujimaki, Kazuyoshi Takagi, Naofumi Takagi

    The 64th Japan Society of Applied Physics Spring Meeting 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Yokohama   Country:Japan  

  195. Demonstration of stored program computing in a 50-GHz SFQ microprocessor with embedded memories International conference

    Akira Fujimaki, Ryo Sato, Yuki Hatanaka, Hiroyuki Akaike, Kazuyoshi Takagi, Takagi Naofumi, Masamitsu Tanaka

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  196. Fabrication of nano-structure transistor based on NbTiN thin films for driving CMOS International conference

    Masato Suzuki, Kohei Maruyama, Masamitsu Tanaka, Hiroyuki Akaike

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  197. Evaluation of a SFQ look-up table based on superconducting phase shift elements for reconfigurable circuits International conference

    Soya Taniguchi, Hiroshi Ito, Takuya Kurihara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  198. Detection sensitivity of single-flux-quantum readout circuits for superconducting strip line detectors International conference

    Hayato Iwashita, Kyohei Kamiya, Masamitsu Tanaka, Ali Bozbey, Hiroyuki Akaike, Akira Fujimaki

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  199. Logic design of a single-flux-quantum gate-level-pipelined microprocessor Invited International conference

    Koki Ishida, Masamitsu Tanaka, Takatsugu Ono, Koji Inoue

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Nagoya, Japan   Country:Japan  

  200. Interface circuits for high-impedance superconductor passive transmission lines International conference

    Yuki Hatanaka, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  201. Design of arithmetic logic ALU toward single-flux-quantum gate- level-pipelined microprocessor International conference

    Masamitsu Tanaka, Ryo Sato, Yuki Hatanaka, Yuichi Matsui, Hiroyuki Akaike, Akira Fujimaki, Koki Ishida, Takatsugu Ono, Koji Inoue

    10th Superconducting SFQ VLSI Workshop (SSV 2017) 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan   Country:Japan  

  202. Energy-efficient, high-performance microprocessors based on single-flux-quantum logic Invited International conference

    Masamitsu Tanaka, Ryo Sato, Yuki Hatanaka, Yuki Ando, Takahiro Kawaguchi, Koki Ishida, Akira Fujimaki, Kazuyoshi Takagi, Naofumi Takagi, Takatsugu Ono, Koji Inoue

    29th International Symposium on Superconductivity (ISS 2016) 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Tokyo, Japan   Country:Japan  

  203. Implementation of a look-up table based on phase shift elements and dual-rail SFQ circuits International conference

    Soya Taniguchi, Hiroshi Ito, Takuya Kurihara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    29th International Symposium on Superconductivity (ISS 2016) 

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    Event date: 2016.12

    Language:English   Presentation type:Poster presentation  

    Venue:Tokyo, Japan   Country:Japan  

  204. Shift-register-based single-flux-quantum cache memory architecture

    Koki Ishida, Masamitsu Tanaka, Takatsugu Ono, Koji Inoue

    Design Gaia 2016 —New Field of VLSI Design— 

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    Event date: 2016.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Ibaraki   Country:Japan  

  205. Demonstration of position-identifying SFQ circuits with two dimensional superconducting strip line detector arrays International conference

    Akira Fujimaki, Kyohei Kamiya, Misaki Kozaka, Ryosuke Naito, Masamitsu Tanaka, Hiroyuki Akaike

    3rd International Workshop on Superconducting Sensors and Detectors (IWSSD 2016) 

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    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tsukuba, Japan   Country:United States  

  206. Eight-bit bit-serial stored-program computer prototype based on rapid single-flux-quantum logic Invited International conference

    Ryo Sato, Yuki Hatanaka, Yuki Ando, Takahiro Kawaguchi, Masamitsu Tanaka, Akira Fujimaki, Kazuyoshi Takagi, Naofumi Takagi

    1st Asian ICMC and CSSJ 50th Anniversary Conference 

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    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Kanazawa, Japan   Country:Japan  

  207. Investigation on cryogenic systems for superconductor digital electronics International conference

    Akira Fujimaki, Masato Suzuki, Yuki Ito, Hiroyuki Akaike, Masamitsu Tanaka

    1st Asian ICMC and CSSJ 50th Anniversary Conference 

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    Event date: 2016.11

    Language:English   Presentation type:Poster presentation  

    Venue:Kanazawa, Japan   Country:Japan  

  208. Development of image sensing system with 2-dimensional serially connected superconducting strip line detectors array

    Kyohei Kamiya, Misaki Kozaka, Ryosuke Naito, Masamitsu Tanaka, Ali Bozbey, Hiroyuki Akaike, Akira Fujimaki

    Technical Committee on Superconductive Electronics, IEICE 

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    Event date: 2016.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sendai   Country:Japan  

  209. Single-flux-quantum cache memory architecture International conference

    Koki Ishida, Masamitsu Tanaka, Takatsugu Ono, Koji Inoue

    13th International SoC Design Conference (ISOCC 2016) 

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    Event date: 2016.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju, Korea   Country:Korea, Republic of  

  210. Implementation and evaluation of single-flux-quantum microprocessor with minimal instruction set architecture for executing programs

    Ryo Sato, Masamitsu Tanaka, Yuki Hatanaka, Hiroyuki Akaike, Akira Fujimaki, Kazuyoshi Takagi, Naofumi Takagi

    2016 IEICE Society Conference 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sapporo   Country:Japan  

  211. Development of Superconductor Strip Line Detector Array and Single-Flux-Quantum Readout Circuits toward One-Megapixel Neutron Imaging

    Akira Fujimaki, Kyohei Kamiya, Ryosuke Naito, Misaki Kozaka, Masamitsu Tanaka, Hiroyuki Akaike

    2016 IEICE Society Conference 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sapporo   Country:Japan  

  212. Energy-efficient rapid single quantum circuit using unshunted junctions

    Yuki Hatanaka, Ryo Sato, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    2016 IEICE Society Conference 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sapporo   Country:Japan  

  213. Fabrication of π Josephson junctions with PdNi/AlOx barrier layer

    Hiroshi Ito, Soya Taniguchi, Takuya Kurihara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 77th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Niigata   Country:Japan  

  214. Evaluation of a look-up table based on dual-rail SFQ circuit using ferromagnets

    Soya Taniguchi, Hiroshi Ito, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 77th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Niigata   Country:Japan  

  215. Effects of HfOx formation method on electrical characteristics of NbTiN junctions

    Kentaro Munemoto, Yoshito Sakakibara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 77th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Niigata   Country:Japan  

  216. Preparation of nano-structure transistors based on NbTiN thin films

    Masato Suzuki, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    The 77th Japan Society of Applied Physics Autumn Meeting 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Niigata   Country:Japan  

  217. Investigation on the individual configuration method of superconducting phase shift elements made of ferromagnetic patterns International conference

    Soya Taniguchi, Hiroshi Ito, Kota Ishikawa, Sota Kurokawa, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    2016 Applied Superconductivity Conference (ASC 2016) 

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    Event date: 2016.9

    Language:English   Presentation type:Poster presentation  

    Venue:Denver, CO, USA   Country:United States  

  218. Josephson-CMOS hybrid memory with nanocryotrons International conference

    Akira Fujimaki, Yuki Ito, Masato Suzuki, Masamitsu Tanaka, Gen Konno, Nobuyuki Yoshikawa

    2016 Applied Superconductivity Conference (ASC 2016) 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Denver, CO, USA   Country:United States  

  219. Demonstration of 4×4 superconductor matrix image sensors integrated with single-flux-quantum digital signal processors International conference

    Akira Fujimaki, Misaki Kozaka, Kyohei Kamiya, Ryosuke Naito, Mutsuo Hidaka, Takekazu Ishida, Masamitsu Tanaka

    2016 Applied Superconductivity Conference (ASC 2016) 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Denver, CO, USA   Country:United States  

  220. High-speed operation of random-access-memory-embedded microprocessors based on rapid single-flux- quantum logic Invited International conference

    Akira Fujimaki, Ryo Sato, Yuki Hatanaka, Yuki Ando, Masamitsu Tanaka, Kazuyoshi Takagi, Naofumi Takagi

    2016 Applied Superconductivity Conference (ASC 2016) 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Denver, CO, USA   Country:United States  

  221. Operation of adiabatic quantum flux parametron logic circuits based on π phase shift elements with ferromagnetic material International conference

    Hiroshi Ito, Soya Taniguchi, Sota Kurokawa, Kota Ishikawa, Takuya Kurihara, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki

    2016 Applied Superconductivity Conference (ASC 2016) 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Denver, CO, USA   Country:United States  

  222. Suppression of heat inflow and Joule heat in closed cycle refrigerator test system with broad band inputs and outputs International conference

    Akira Fujimaki, Yuki Ito, Masato Suzuki, Masamitsu Tanaka

    2016 Applied Superconductivity Conference (ASC 2016) 

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    Event date: 2016.9

    Language:English   Presentation type:Poster presentation  

    Venue:Denver, CO, USA   Country:United States  

  223. Single-flux-quantum readout and digital signal processing of serially-connected superconducting stripline detection array

    Ryosuke Naito, Kyohei Kamiya, Misaki Kozaka, Masamitsu Tanaka, Akira Fujimaki

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    Event date: 2016.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Saitama   Country:Japan  

  224. 単一磁束量子回路を用いたマイクロプロセッサの論理設計と評価

    石田浩貴, 田中雅光, 小野貴継, 井上弘士

    LSIとシステムのワークショップ2016 

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    Event date: 2016.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京   Country:Japan  

  225. Demonstration of low-voltage rapid single flux quantum circuit using unshunted Josephson junctions

    Yuki Hatanaka, Ryo Sato, Masamitsu Tanaka, Akira Fujimaki

    Technical Committee on Superconductive Electronics, IEICE 

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    Event date: 2016.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  226. On-chip implementation of random-access-memory and RSFQ microprocessor with high-functionality

    Ryo Sato, Yuki Ando, Masamitsu Tanaka, Akira Fujimaki, Kazuyoshi Takagi, Naofumi Takagi

    Technical Committee on Superconductive Electronics, IEICE 

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    Event date: 2016.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tokyo   Country:Japan  

  227. Demonstration of Individual Readout of Serially-Connected Superconducting Strip Line Detectors International conference

    Kyohei Kamiya, Yuma Kita, Misaki Kozaka, Masamitsu Tanaka, Ali Bozbey, and Akira Fujimaki

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  228. Vortex Transitional Memory Developed with Nb 4-Layer, 10-kA/cm2 Fabrication Process International conference

    Yuto Komura, Masamitsu Tanaka, Akira Fujimaki, Shuichi Nagasawa, and Ali Bozbey

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  229. Experimentally Verified Numerical analysis of serially connected superconducting strip line detector arrays driven by a single current source International conference

    Ali Bozbey, Yuma Kita, Misaki Kozaka, Masamitsu Tanaka, Takekazu Ishida, and Akira Fujimaki

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  230. 80-GHz Operation of an 8-bit RSFQ Arithmetic Logic Unit International conference

    Yuki Ando, Ryo Sato, Masamitsu Tanaka, Kazuyoshi Takagi, and Naofumi Takagi

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  231. Reconfigurable Logic Gate of Quantum-Flux-Parametron Using Magnetic Material International conference

    Sota Kurokawa, Akihisa Tsune, Hiroshi Ito, Soya Taniguchi, Kota Ishikawa, Masamitsu Tanaka, Hiroyuki Akaike, and Akira Fujimaki

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  232. Low-Voltage Bit-Serial Single-Flux-Quantum Microprocessor for Integrating Memories International conference

    Ryo Sato, Kensuke Takata, Masamitsu Tanaka, Akira Fujimaki, Naofumi Takagi, and Kazuyoshi Takagi

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  233. Development of an Optimizer for Vortex Transitional Memory using Particle Swarm Optimization International conference

    Mustafa A. Karamüftüoğlu, Seda Demirhan, Yuto. Komura, Mustafa E. Çelik, Masamitsu Tanaka, Ali Bozbey, and Akira Fujimaki

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  234. Application of Superconducting Phase Shift Elements Made of Ferromagnetic Patterns to Single-Flux-Quantum Circuits for Reconfigurable Functions International conference

    Soya Taniguchi, Hiroshi Ito, Kota Ishikawa, Sota Kurokawa, Akihisa Tsune, Masamitsu Tanaka, Hiroyuki Akaike, and Akira Fujimaki

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  235. Development of Bit-Serial RSFQ Microprocessors Integrated with Shift-Register-Based Random Access Memories International conference

    Masamitsu Tanaka, Kensuke Takata, Ryo Sato, Akira Fujimaki, Takahiro Kawaguchi, Yuki Ando, Kazuyoshi Takagi, Naofumi Takagi, and Nobuyuki Yoshikawa

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  236. Demonstration of an 8-bit SFQ Carry Look-Ahead Adder using Clockless Logic Cells International conference

    Takahiro Kawaguchi, Masamitsu Tanaka, Kazuyoshi Takagi, and Naofumi Takagi

    15th International Superconductive Electronics Conference (ISEC 2015) 

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    Event date: 2015.7

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  237. Development of Miniaturized Vortex Transitional Memory Using Nb 4-Layer, High-JC Fabrication Process

    Yuto Komura, Masamitsu Tanaka, Akira Fujimaki, Shuichi Nagasawa, and Ali Bozbey

    91th Cryogenics and Superconductivity Society of Japan Conference (2015 Spring) 

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    Event date: 2015.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  238. Individual Readout of Array of Serially-Connected Superconductor Detectors

    Kyohei Kamiya, Yuma Kita, Misaki Kouzaka, Ali Bozbey, Akira Fujimaki, and Masamitsu Tanaka

    The 62nd Japan Society of Applied Physics Spring Meeting, 2015 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  239. Study on Multifunctional Operations of Single-Flux-Quantum Circuits with Superconducting Phase Shift Elements Made of Ferromagnetic Patterns

    Soya Taniguchi, Hiroshi Ito, Kouta Ishikawa, Sota Kurokawa, Akihisa Tsune, Masamitsu Tanaka, Hiroyuki Akaike, and Akira Fujimaki

    The 62nd Japan Society of Applied Physics Spring Meeting, 2015 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  240. Reconfigurable quantum-flux-parametron circuits using a magnetic material

    Sota Kurokawa, Akihisa Tsune, Hiroshi Ito, Soya Taniguchi, Masamitsu Tanaka, Hiroyuki Akaike, and Akira Fujimaki

    The 62nd Japan Society of Applied Physics Spring Meeting, 2015 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  241. 100-GHz Bit-Serial Adder Using 20-kA/cm2 Nb/AlOx/Nb Juncstions

    Masamitsu Tanaka, Ryo Sato, Akira Fujimaki, Shuichi Nagasawa, and Mutsuo Hidaka

    The 62nd Japan Society of Applied Physics Spring Meeting, 2015 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  242. Design of 8-bit Serial Single-Flux-Quantum Microprocessor with Extended Functions

    Ryo Sato, Kensuke Takata, Masamitsu Tanaka, Akira Fujimaki, Kazuyoshi Takagi, and Naofumi Takagi

    Institute of Electronics, Information and Communication Engineers General Conference, 2015 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  243. Implementation of High-Density Single-Flux-Quantum Shift-Register Memory System

    Masamitsu Tanaka and Akira Fujimaki

    Institute of Electronics, Information and Communication Engineers General Conference, 2015 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  244. 35-GHz Demonstration of Energy-Efficient Microprocessor Based on Low-Voltage RSFQ Circuit International conference

    Masamitsu Tanaka, Yuhi Hayakawa, Kensuke Takata, Akira Fujimaki

    Applied Superconductivity Conference (ASC 2014) 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:United States  

  245. Low-Voltage Rapid Single-Flux-Quantum Circuits Fabricated Using 20-kA/cm2 Nb/AlOx/Nb Process International conference

    Masamitsu Tanaka, Misaki Kozaka, Yuma Kita, Akira Fujimaki, Shuichi Nagasawa, Mutsuo Hidaka

    Applied Superconductivity Conference (ASC 2014) 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  246. Monolithic Integrated Circuits Composed of 1000 Neutron Detectors and Rapid Single Flux Quantum Readout Circuits International conference

    Akira Fujimaki, Yuma Kita, Keisuke Ito, Misaki Kozaka, Masamitsu Tanaka, Mutsuo Hidaka, Takekazu Ishida

    Applied Superconductivity Conference (ASC 2014) 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  247. Evaluation of low-energy rapid single-flux-quantum circuits based on 20-kA/cm2 process

    Masamitsu Tanaka, Misaki kozaka, Yuma kita, Akira Fujimaki, Shuichi Nagasawa, Mutsuo Hidaka

    89th Cryogenics and Superconductivity Society of Japan Conference (2014 Spring) 

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    Event date: 2014.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  248. Development of Datapath for RSFQ High-Performance, Energy-Efficient Microprocessors Based on Bit-Slice Microarchitecture International conference

    Masamitsu Tanaka, Yuhi Hayakawa, Kensuke Takata, Akira Fujimaki, Yukio Ohmomo, Takahiro Kawaguchi, Kazuyoshi Takagi, Naofumi Takagi

    4th International Conference on Superconductivity and Magnetism (ICSM 2014) 

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    Event date: 2014.4 - 2014.5

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Turkey  

  249. Energy-efficient superconductor circuits

    Masamitsu Tanaka

    92th Conference of 146th Committee on Superconductive Electronics, Japan Society for the Promotion of Science 

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    Event date: 2014.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  250. 10 kA/cm2 Nbプロセスを用いた4bit ビットスライスALUの設計と評価

    髙田賢介, 早川雄飛, 田中雅光, 藤巻朗

    電子情報通信学会2014年総合大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学   Country:Japan  

▼display all

Works 1

  1. Leporis: Database of SFQ-based LSI Experimental Results

    2005.7

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    Work type:Database science  

Research Project for Joint Research, Competitive Funding, etc. 4

  1. Highly Energy-Efficient Processing by Controlling Flexibility of Information Carrier Utilizing Artificial Spins

    Grant number:JPMJCR20C5  2020.12 - 2026.3

    JST Basic Research Programs (CREST) 

    Tanaka, Masamitsu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\186550000 ( Direct Cost: \143500000 、 Indirect Cost:\43050000 )

    We control the flexibility of the information carrier, by which stored information is rigidly held or easily affected by external disturbance, to change the energy consumption in switching widely and dynamically. This research aims to integrate artificial spins using superconductor devices and develop the computing technology based on highly energy-efficient, approximate operation or interaction of flexible information carrier by cross-layer approach.

  2. Development of Integrated Technology for Superconducting Quantum Circuits

    Grant number:JPMJMS2067  2020.12 - 2026.3

    Moonshot Research and Development 

    Yamamoto, Tsuyoshi

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\183300000 ( Direct Cost: \141000000 、 Indirect Cost:\42300000 )

  3. Superconducting Computing for Low Carbon AI

    Grant number:JPMJMI18E1  2018.11 - 2023.3

    JST-Mirai Program 

    Inoue, Koji

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\61100000 ( Direct Cost: \47000000 、 Indirect Cost:\14100000 )

    Moore's Law, doubling the number of transistors in a chip every two years, has so far been contributed to the evolution of computer systems. The growth of such hardware implementation makes a lot of optimization opportunities available to software developers. Unfortunately, we cannot expect sustainable transistor shrinking anymore, i.e., the end of Moore's Law will come. The goal of this research is to open up post-CMOS ultra high-performance, low-power computing. Our approach stands on circuit/architecture/algorithm level co-designs by targeting an emerging device called SFQ (single-flux-quantum). This project aims to propose an SFQ based neural-network accelerator called SFNuro.

  4. 極低温単一磁束量子ニューラル・コンピューティング

    2017.10 - 2018.3

    未来社会創造事業 

    井上弘士

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

KAKENHI (Grants-in-Aid for Scientific Research) 17

  1. Quantum Annealing to Solve Complex Optimization Problems Using Negative Inductance and Thermal Fluctuations

    Grant number:23H05447  2023.4 - 2028.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  2. Fundamentals of Quantum Annealer for Solving Complex Optimization Problems Using Negative Inductance and Thermal Fluctuations

    Grant number:23H00180  2023.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  3. Creation and development of superconducting computing technology for post-Moore era

    Grant number:22H05000  2022.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Inoue, Koji; Tanaka, Masamitsu; Kawakami, Satoshi; Itagaki, Naho; Tanimoto, Teruo; Hamaya, Kohei

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\5980000 ( Direct Cost: \4600000 、 Indirect Cost:\1380000 )

  4. Extremely Low-Power Half-Flux-Quantum Circuits using Novel, Large Inductance Induced by Magnetic Josephson Junctions

    Grant number:22H00518  2022.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Inoue, Koji; Tanaka, Masamitsu; Kawakami, Satoshi; Tanimoto, Teruo; Hirokawa, Masao; Ono, Takatsugu

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  5. Extremely Low-Power Half-Flux-Quantum Circuits using Novel, Large Inductance Induced by Magnetic Josephson Junctions

    Grant number:22H01548  2022.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Tanaka, Masamitsu

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    Authorship:Principal investigator 

    Grant amount:\16770000 ( Direct Cost: \12900000 、 Indirect Cost:\3870000 )

  6. Creation of extremely energy-efficient integrated circuit technology beyond the thermodynamic limit based on reversible quantum flux circuits

    Grant number:19H05614  2019.6 - 2024.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Yoshikawa, Nobuyuki; Yamanashi, Yuki; Takeuchi Naoki; Ayala Christopher; Tanaka Masamitsu; Makise, Kazumasa

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\49400000 ( Direct Cost: \38000000 、 Indirect Cost:\11400000 )

  7. Large-scale superconducting spintronics quantum computing circuits toward the realization of quantum supremacy

    Grant number:19H05615  2019.6 - 2024.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Yamashita, Taro; Tanaka, Masamitsu; Inomata, Kunihiro; Miyajima Shigeyuki

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\2500000 ( Direct Cost: \2500000 )

  8. ポストムーア時代を支える100ギガヘルツ級時空間超伝導コンピューティング

    Grant number:19H01105  2019.4 - 2022.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    井上 弘士, 松永 裕介, 田中 雅光, 岩下 武史, 谷本 輝夫, 小野 貴継

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\12220000 ( Direct Cost: \9400000 、 Indirect Cost:\2820000 )

    本研究では,①空間計算型SFQプロセッサ技術の確立,②時間計算型SFQプロセッサ技術の確立,③100 GHz級SFQ回路を対象とする設計自動化技術の確立,④時空間超伝導コンピューティング法の確立,の4つの研究課題を設定する.これらを遂行することにより,単一磁束量子回路を用いた 100 GHz 級超高速ビット並列型プロセッサを世界に先駆けて実現する.汎用空間方向処理とレースロジック方式による時間方向処理を融合した新しい超伝導コンピューティング・アーキテクチャ技術を確立し,ポストムーア時代を支えるコンピューティング基盤へとつなげる.

  9. Characterization of Low-Energy Particle Detector toward Measurement of Angular Correlation between Neutrino and Electron in Beta Decay

    Grant number:19H05098  2019.4 - 2021.3

    Ministry of Education, Culture, Sports, Science and Technology  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Tanaka, Masamitsu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

  10. 量子超越性を導く超伝導スピントロニクス量子計算回路の創出

    Grant number:19H00764  2019.4 - 2019.6

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    山下 太郎, 田中 雅光, 猪股 邦宏, 宮嶋 茂之

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\84660 ( Direct Cost: \84660 )

    量子計算分野において、古典計算機を凌駕する計算能力を表す「量子超越性」の実験的実証は、全世界的に喫緊の研究課題として注目されている。その実証には、量子回路の大規模化(量子ビット数の増加)を、コヒーレンス時間(量子状態を保持可能な時間)等の性能劣化なく達成することが必要不可欠である。本研究では、本研究チームが誇る大規模化可能なπ接合量子回路と超低消費電力性を有する半磁束量子回路という世界最高峰のコア技術を融合することで、その量子超越性の実証に向けた基盤技術の確立を目指す。

  11. Study on Quantum Mechanical Limit of Operating Speed in Single-Flux-Quantum Circuits

    Grant number:18H01498  2018.4 - 2022.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Tanaka, Masamitsu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\17030000 ( Direct Cost: \13100000 、 Indirect Cost:\3930000 )

  12. Study on Adiabatic Single-Flux-Quantum Circuits Operating in the Thermodynamic Energy Limit

    Grant number:26220904  2018.4 - 2019.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    YOSHIKAWA Nobuyuki

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\2535000 ( Direct Cost: \1950000 、 Indirect Cost:\585000 )

    The aim of this study is the realization of extraordinarily energy-efficient logic circuits operating in the thermodynamic energy limit using superconducting logic circuits. Our approach utilizes the adiabatic operation of quantum flux parametron (AQFP) by changing its phase difference adiabatically or very slowly. Since the bit energy of the AQFP circuits is about six orders of magnitude smaller than that of the state-of-the-art CMOS circuits, the energy consumption of the information systems can be significantly reduced, even considering the cooling energy. In this study, we clarified the basic characteristics of AQFP circuits and established the fundamental technology for designing large-scale AQFP circuits. In addition, we developed a high-density memory and a three-dimensional integrated circuit process, which are necessary for the practical application of the information processing system. We have demonstrated the energy-efficient high-speed operation of AQFP processors.

  13. Research on 100 GHz Ultra-High-Speed Superconducting Microprocessor Architecture

    Grant number:16H02796  2016.4 - 2019.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Inoue, Koji

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\13910000 ( Direct Cost: \10700000 、 Indirect Cost:\3210000 )

    In this research, we have proposed a novel microprocessor architecture that supports gate-level fine-grained pipeline structure for superconductor single-flux-quantum (SFQ) computing. We have successfully demonstrated a design of 48 GHz 5.6mW ultra-high-speed 8-bit SFQ multiplier by gate-level pipelining. The design results have been presented in 2019 IEEE International Solid-State Circuits Conference (ISSCC) that is one of the biggest conference focusing on semiconductor technologies. In addition to such prototype design, a 4-bit SFQ microprocessor has been designed, and we have confirmed its correct operation on circuit simulations. The SFQ microprocessor operates on 30 GHz that cannot be achieved by using traditional CMOS circuits.

  14. Single-Flux-Quantum Microprocessor Architecture for Space Computing

    Grant number:26540022  2014.4 - 2016.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Inoue, Koji

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Competitive

    CMOS microprocessors have been facing with a limitation of clock speeds because of increasing power consumption (i.e., power-wall problem). Single-Flux-Quantum (SFQ) devices and circuits are promising to solve the power-wall problem due to its ultra high-speed, low-power natures. This research explores the design space of microarchitecture to exploit the potential of SFQ devices and circuits. A novel architecture that supports SFQ-gate level fine-grained superpipelining with deep multithreading has been proposed. Our estimation presents that it has a potential to achieve 50X clock speed improvement compared to state-of-the-art CMOS microprocessors with several watt power comsumption. Since the estimation does not consider the speed and power overhead caused by layout, our future work is to implement the proposed microarchitecture with physical designs.

  15. Research on Large-capacity, Low-power Shift-register-based Memories Based on Single-flux-quantum Logic Circuits

    Grant number:24760276  2012.4 - 2015.3

    Japan Society for the Promotion of Scienc  Grant-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Tanaka, Masamitsu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    The research on large-capacity, low-power shift-register-based memories was done toward realization of high-performance computing system based on the single-flux-quantum logic technology. A compact, low-power shift-register cell was newly developed. The low-voltage circuit design technique was established, which is applicable to not only the shift-register-based memories but also to general circuits, achieving high energy efficiency. These results supports the feasibility of a few kilobits, ultra-high-speed memories with reasonable density and power consumption.

  16. All Solid State Superconducting System for Neutron Radiography with One Million Pixels and Submicron Resolution

    Grant number:23226019  2011.4 - 2016.3

    Japan Society for the Promotion of Scienc  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Ishida, Takekazu

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Competitive

    We developed a serial current-biased kinetic inductance detector (CB-KID) with an SFQ encoder providing neutron event address. We confirmed its proper operation with the aid of pulsed laser irradiation experiments instead of neutron irradiation. We also fabricated a mega-pixel chip consisting of 1000-CH-X-CB-KIDs and 1000-CH-Y-CB-KIDs on a monolithic Si chip. However, we recognized that the overwhelming excess noise, particularly appeared in J-PARC facility, prevented our device from operating the ultimate CB-KID chip with SFQ readout circuits in a proper manner. Alternatively, we proposed a new idea of a delay-line CB-KID system consisting of two submicrometer (0.9 um) wires (40-nm thick, 150-m long) on a 22mmx22mm chip. We finally fulfilled megapixel-class imaging of 225-mm2 active area by using a submicrometer Nb nanowire at the pulsed neutron facility J-PARC. The wave-length-selective neutron radiography, achieved by us, is apparently beyond the scope of our original proposal.

  17. Study on Generation of Highly-Reliable Single-Flux-Quantum Cell Library

    Grant number:21760256  2009.4 - 2012.3

    Japan Society for the Promotion of Scienc  Grant-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Tanaka, Masamitsu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2730000 ( Direct Cost: \2100000 、 Indirect Cost:\630000 )

    The research focused on techniques to generate sets of basic circuit elements(cell libraries), which are essential to design large-scale single-flux-quantum(SFQ) digital circuits. The improved design guidelines to make reliable cells, including power supplying and the tradeoff between performance and power consumptions, were investigated. Several tools were developed for layout design toward automatic generation of wiring cells, which are dominant in cell libraries.

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Industrial property rights 1

  1. 整流素子および超伝導回路用の電源回路

    藤巻朗, 田中雅光, 谷口壮耶

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    Application no:2017-064951  Date applied:2017.3

    Country of applicant:Domestic  

 

Teaching Experience (On-campus) 39

  1. Advanced Lectures on Integrated Quantum Devices

    2023

  2. Advanced Experiments and Exercises in Electronic Engineering

    2023

  3. Quantum Mechanics with Exercises

    2023

  4. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2023

  5. Theory of Electromagnetics

    2023

  6. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2023

  7. Quantum Mechanics with Exercises

    2022

  8. Advanced Lectures on Integrated Quantum Devices

    2022

  9. Theory of Electromagnetics

    2022

  10. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2022

  11. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2022

  12. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2021

  13. Theory of Electromagnetics

    2021

  14. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2021

  15. Advanced Lectures on Integrated Quantum Devices

    2021

  16. Quantum Mechanics with Exercises

    2021

  17. Advanced Lectures on Integrated Quantum Devices

    2020

  18. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2020

  19. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2020

  20. Theory of Electromagnetics

    2020

  21. Quantum Mechanics with Exercises

    2019

  22. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2019

  23. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2019

  24. Advanced Lectures on Integrated Quantum Devices

    2019

  25. Quantum Mechanics with Exercises

    2018

  26. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2018

  27. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2018

  28. Advanced Lectures on Integrated Quantum Devices

    2018

  29. Quantum Mechanics with Exercises

    2017

  30. Laboratory in Electrical Engineering, Electronics and Information Electronics I

    2017

  31. Advanced Lectures on Integrated Quantum Devices

    2017

  32. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2017

  33. Advanced Lectures on Integrated Quantum Devices

    2016

  34. Laboratory in Electrical Engineering, Electronics and Information Electronics II

    2016

  35. Quantum Mechanics with Exercises

    2016

  36. Advanced Lectures on Integrated Quantum Devices

    2015

  37. Quantum Mechanics with Exercises

    2015

  38. Advanced Lectures on Integrated Quantum Devices

    2014

  39. Quantum Mechanics with Exercises

    2014

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Teaching Experience (Off-campus) 3

  1. デジタル電子回路

    2022.4 - 2022.9 Meijo University)

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    Level:Undergraduate (specialized) 

  2. デジタル電子回路

    2021.4 - 2021.9 Meijo University)

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    Level:Undergraduate (specialized) 

  3. デジタル電子回路

    2020.4 - 2020.9 Meijo University)

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    Level:Undergraduate (specialized) 

 

Media Coverage 4

  1. NEC、超電導で試験環境 量子計算機 国産技術を実証 Newspaper, magazine

    日刊工業新聞社  日刊工業新聞  朝刊1面  2024.3

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    Author:Other 

  2. Focal Point on Quantum computing in Japan Newspaper, magazine

    Springer Nature Limited  nature  Focal Point  2024.2

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    Author:Other 

  3. 大規模量子コンピューター開発に光明 Newspaper, magazine

    科学新聞社  科学新聞  5面  2021.12

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    Author:Other 

  4. 極低温で量子誤り訂正 Newspaper, magazine

    日刊工業新聞社  日刊工業新聞  23面  2021.11

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    Author:Other 

Academic Activities 11

  1. 情報処理学会第11回量子ソフトウェア研究発表会世話人 International contribution

    Role(s):Planning, management, etc.

    2024.3

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    Type:Academic society, research group, etc. 

  2. Program Committee, Quantum, Cryogenic and Superconductive Computing (QUEST2024) International contribution

    Role(s):Planning, management, etc., Panel moderator, session chair, etc.

    2024.1 - 2024.9

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    Type:Academic society, research group, etc. 

  3. 電気学会ニューロモルフィック回路実装に向けたハードウェアに関する調査専門委員会

    Role(s):Planning/Implementing academic research

    2023.11 - 2025.10

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    Type:Academic research 

  4. Associate Editor, IEEE Transactions on Applied Superconductivity Editorial Staff International contribution

    Role(s):Peer review

    2020.6

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    Type:Peer review 

  5. Editorial Committee of the IEICE Transactions on Electronics International contribution

    Role(s):Peer review

    2020.6 - 2023.6

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    Type:Peer review 

  6. Editorial Committee of the IEICE Electronics Express International contribution

    Role(s):Peer review

    2020.6 - 2023.6

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    Type:Peer review 

  7. 電気学会量子コンピュータ周辺回路としての低温デジタル回路活用に関する調査専門委員

    Role(s):Planning/Implementing academic research

    2019.11 - 2021.10

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    Type:Academic research 

  8. Editorial Committee of the IEICE Transactions on Electronics (Japanese Edition)

    Role(s):Peer review

    2019.6 - 2025.6

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    Type:Peer review 

  9. Program Committee, International Symposium on Superconductivity International contribution

    Role(s):Planning, management, etc., Panel moderator, session chair, etc.

    2016.4

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    Type:Academic society, research group, etc. 

  10. 日本学術振興会超伝導エレクトロニクス第146委員会幹事

    Role(s):Planning, management, etc.

    2015.4

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    Type:Academic society, research group, etc. 

  11. 電気学会位相エンジニアリングに基づく低温エレクトロニクス調査専門委員

    Role(s):Planning/Implementing academic research

    2013.10 - 2016.9

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    Type:Academic research 

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