Updated on 2024/03/29
Ph. D. （ 2006.3 Nagoya University ）
M. E. （ 2003.3 Nagoya University ）
Integrated Circuit Systems
Superconductor Electronics
Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment / Electronics
Ultra high-speed, low-power electronics using superconductor
Nagoya University Department of Electronics, Graduate School of Engineering Associate professor
2022.10
Nagoya University Department of Electronics, Graduate School of Engineering Assistant Professor
2017.4 - 2022.9
Country：Japan
Nagoya University Department of Quantum Engineering Quantum, Graduate School of Engineering Assistant Professor
2016.7 - 2017.3
Country：Japan
Nagoya University PhD Professional Office Designated lecturer
2013.2 - 2016.6
Country：Japan
Nagoya University PhD Professional Office Designated lecturer
2012.12 - 2013.1
Country：Japan
Nagoya University Institute for Advanced Research Designated assistant professor
2010.7 - 2012.11
Country：Japan
Nagoya University Department of Information Engineering, Graduate School of Information Science Designated assistant professor
2009.4 - 2010.6
Country：Japan
Nagoya University Department of Information Engineering, Graduate School of Information Science Researcher
2007.4 - 2009.3
Country：Japan
Japan Society for Promotion of Science Researcher
2005.4 - 2007.3
Nagoya University Graduate School, Division of Engineering Information Engineering
2003.4 - 2006.3
Country： Japan
Nagoya University Graduate School, Division of Engineering Electronic Engineering
2001.4 - 2003.3
Country： Japan
Institute of Electrical Engineers of Japan General Member
2013.9
Cryogenics and Superconductivity Society of Japan Member
2013.7
Institute of Electrical and Electronics Engineers Senior Member
2005.1
Japan Society of Applied Physics Regular Member
2004.1
Institute of Electronics, Information and Communication Engineers Member
2002.4
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
Committee type：Academic society
Technical Committee on Metal and Ceramics, The Institute of Energy Economics, Japan Committee Member
2023.2
Committee type：Academic society
IEEE Transactions on Applied Superconductivity Editorial Staff Associate Editor
2020.6
Committee type：Academic society
Editorial Committee of the IEICE Transactions on Electronics Associate Editor
2020.6 - 2026.6
Committee type：Academic society
Editorial Committee of the IEICE Electronics Express Associate Editor
2020.6 - 2026.6
Committee type：Academic society
Editorial Committee of the IEICE Transactions on Electronics (Japanese Edition) Associate Editor
2019.6 - 2025.6
Committee type：Academic society
Member
2016
Committee type：Academic society
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
Committee type：Academic society
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
Committee type：Academic society
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
Committee type：Academic society
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
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
19th Superconductivity Science and Technology Award
2015.4 Forum of Superconductivity Science and Technology, The Society of Non-Traditional Technology
JSPS 146th Committee Award
2015.4 The 146th Committee on Superconductive Electronics, The Japan Society for the Promotion of Science
Excellent Presentation Award in 2014
2014.5 Cryogenics and Superconductivity Society of Japan
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Interactive visualization of single flux quantum circuits, a device expected to be on board spacecraft Reviewed
Vol. 12 page： 31 - 40 2023.2
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Extremely Energy-efficient Computing Based on Superconductor Reviewed
Vol. 101 ( 12 ) page： 1207-1211 2018.12
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
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
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
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
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
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
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
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
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
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
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)
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)
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)
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)
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)
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)
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)
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Optimization of circuit parameters of half flux quantum circuits
Shoma Tanemura, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
2022 IEICE General Conference 2022.3.16
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
Interactive Visualization of SFQ Transmission Line
Akira Miura, Keiichi Matsuzaki, Takayuki Ishida, Masamitsu Tanaka, Koji Inoue
2022 IEICE General Conference 2022.3.16
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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
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)
Study on superconductor nano-structured line drivers in random access memories
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)
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）
Study on superconductor low-energy particle detectors for measurement of angular correlation between neutrino and electron in beta decay
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
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
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
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
Superconducting phase engineering in flux-quantum-based circuits for higher performances
Akira Fujimaki, Soya Taniguchi, Masamitsu Tanaka
2018 Annual Meeting of the IEEJ
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
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
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
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
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
Study on nano-structured devices based on pseudo-two-dimensional superconductors
Kyosuke Sano, Masato Suzuki, Kyohei Maruyama, Masamitsu Tanaka, Akira Fujimaki, Masumi Inoue
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
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)
Cryogenic Digital Electronics --Challenges for Practical Use-- Invited International conference
Akira Fujimaki, Masamitsu Tanaka
30th International Symposium on Superconductivity (ISS2017)
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)
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
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
Towards to ultra high-speed single-flux-quantum computing International conference
Koji Inoue, Masamitsu Tanaka
Arm Research Summit 2017
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
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
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
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
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
Fabrication and evaluation of superconducting thermally-assisted nano-structured transistors using NbTiN thin films
Kyosuke Sano, Masato Suzuki, Kyohei Maruyama, Masamitsu Tanaka, Akira Fujimaki
Superconducting rectifiers based on residual magnetization of ferromagnetic patterns
Soya Taniguchi, Hayato Iwashita, Kyosuke Sano, Masamitsu Tanaka, Akira Fujimaki
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)
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)
Impact of recent advancement in cryogenic circuit technology Invited International conference
Akira Fujimaki, Masamitsu Tanaka
16th International Superconductive Electronics Conference (ISEC 2017)
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)
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)
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
Narrowed superconductor passive transmission lines with the advanced process
Yuki Hatanaka, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki
2017 IEICE General Conference
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
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
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
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
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)
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)
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)
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)
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)
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)
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)
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)
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)
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—
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)
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
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
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
Single-flux-quantum cache memory architecture International conference
Koki Ishida, Masamitsu Tanaka, Takatsugu Ono, Koji Inoue
13th International SoC Design Conference (ISOCC 2016)
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
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
Energy-efficient rapid single quantum circuit using unshunted junctions
Yuki Hatanaka, Ryo Sato, Masamitsu Tanaka, Hiroyuki Akaike, Akira Fujimaki
2016 IEICE Society Conference
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
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
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
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
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)
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)
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)
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)
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)
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)
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
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
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
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
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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
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
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
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
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
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
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)
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)
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)
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)
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)
Energy-efficient superconductor circuits
Masamitsu Tanaka
92th Conference of 146th Committee on Superconductive Electronics, Japan Society for the Promotion of Science
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
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
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.
Development of Integrated Technology for Superconducting Quantum Circuits
Grant number：JPMJMS2067 2020.12 - 2026.3
Moonshot Research and Development
Yamamoto, Tsuyoshi
Authorship：Coinvestigator(s) Grant type：Competitive
Grant amount：\183300000 （ Direct Cost: \141000000 、 Indirect Cost：\42300000 ）
Superconducting Computing for Low Carbon AI
Grant number：JPMJMI18E1 2018.11 - 2023.3
JST-Mirai Program
Inoue, Koji
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.
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
Authorship：Coinvestigator(s) Grant type：Competitive
Grant amount：\3900000 （ Direct Cost: \3000000 、 Indirect Cost：\900000 ）
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)
Authorship：Coinvestigator(s) Grant type：Competitive
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)
Authorship：Coinvestigator(s) Grant type：Competitive
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
Authorship：Coinvestigator(s) Grant type：Competitive
Grant amount：\5980000 （ Direct Cost: \4600000 、 Indirect Cost：\1380000 ）
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
Authorship：Coinvestigator(s) Grant type：Competitive
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
Authorship：Principal investigator
Grant amount：\16770000 （ Direct Cost: \12900000 、 Indirect Cost：\3870000 ）
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
Authorship：Coinvestigator(s) Grant type：Competitive
Grant amount：\49400000 （ Direct Cost: \38000000 、 Indirect Cost：\11400000 ）
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
Authorship：Coinvestigator(s) Grant type：Competitive
Grant amount：\2500000 （ Direct Cost: \2500000 ）
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
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．
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
Authorship：Principal investigator Grant type：Competitive
Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）
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
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。
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
Authorship：Principal investigator Grant type：Competitive
Grant amount：\17030000 （ Direct Cost: \13100000 、 Indirect Cost：\3930000 ）
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
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.
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
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.
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
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.
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
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.
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
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.
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
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.
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
Advanced Lectures on Integrated Quantum Devices
2023
Advanced Experiments and Exercises in Electronic Engineering
2023
Quantum Mechanics with Exercises
2023
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2023
Theory of Electromagnetics
2023
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2023
Quantum Mechanics with Exercises
2022
Advanced Lectures on Integrated Quantum Devices
2022
Theory of Electromagnetics
2022
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2022
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2022
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2021
Theory of Electromagnetics
2021
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2021
Advanced Lectures on Integrated Quantum Devices
2021
Quantum Mechanics with Exercises
2021
Advanced Lectures on Integrated Quantum Devices
2020
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2020
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2020
Theory of Electromagnetics
2020
Quantum Mechanics with Exercises
2019
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2019
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2019
Advanced Lectures on Integrated Quantum Devices
2019
Quantum Mechanics with Exercises
2018
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2018
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2018
Advanced Lectures on Integrated Quantum Devices
2018
Quantum Mechanics with Exercises
2017
Laboratory in Electrical Engineering, Electronics and Information Electronics I
2017
Advanced Lectures on Integrated Quantum Devices
2017
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2017
Advanced Lectures on Integrated Quantum Devices
2016
Laboratory in Electrical Engineering, Electronics and Information Electronics II
2016
Quantum Mechanics with Exercises
2016
Advanced Lectures on Integrated Quantum Devices
2015
Quantum Mechanics with Exercises
2015
Advanced Lectures on Integrated Quantum Devices
2014
Quantum Mechanics with Exercises
2014
デジタル電子回路
2022.4 - 2022.9 （Meijo University）
Level：Undergraduate (specialized)
デジタル電子回路
2021.4 - 2021.9 （Meijo University）
Level：Undergraduate (specialized)
デジタル電子回路
2020.4 - 2020.9 （Meijo University）
Level：Undergraduate (specialized)
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
Focal Point on Quantum computing in Japan Newspaper, magazine
Springer Nature Limited nature Focal Point 2024.2
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
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
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
Program Committee, Quantum, Cryogenic and Superconductive Computing (QUEST2024) International contribution
Role(s)：Planning, management, etc., Panel moderator, session chair, etc.
2024.1 - 2024.9
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
Associate Editor, IEEE Transactions on Applied Superconductivity Editorial Staff International contribution
Role(s)：Peer review
2020.6
Editorial Committee of the IEICE Transactions on Electronics International contribution
Role(s)：Peer review
2020.6 - 2023.6
Editorial Committee of the IEICE Electronics Express International contribution
Role(s)：Peer review
2020.6 - 2023.6
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
Editorial Committee of the IEICE Transactions on Electronics (Japanese Edition)
Role(s)：Peer review
2019.6 - 2025.6
Program Committee, International Symposium on Superconductivity International contribution
Role(s)：Planning, management, etc., Panel moderator, session chair, etc.
2016.4
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
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
