Development of design methodology of superconducting integrated circuit containing pi-shifted Josephson junctions and its applications

• Project/Area Number: 18K04280
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Yokohama National University
• Principal Investigator: Yamanashi Yuki 横浜国立大学, 大学院工学研究院, 准教授 (70467059)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: パイ遷移ジョセフソン接合 / 単一磁束量子回路 / ジョセフソン接合 / 超伝導集積回路 / 磁性ジョセフソン接合 / 低電力回路 / 回路シミュレータ / 超伝導回路

Outline of Final Research Achievements

A superconductor circuit can operate at the frequency of tens GHz with extremely low power consumption. The performance of the superconductor circuit can be improved by introducing pi-shifted Josephson junctions. We developed a design methodology for the superconducting circuits that enables us to design any logic gates with pi-shifted Josephson junctions. We developed a analog circuit simulator for the circuits that contain pi-shifted Josephson junctions. We found that the non-destructive read-out logic gate that contains pi-shifted Josephson junctions can be implemented with less than half of circuit area of the conventional circuit.

Academic Significance and Societal Importance of the Research Achievements

本研究により、超伝導回路のさらなる性能向上が可能になった。特に相補出力型の論理ゲートの大幅な小面積化と性能向上は、大規模なディジタル回路に欠かせないデコーダ回路の性能向上につながり、超伝導回路によるランダムアクセスメモリの大幅な小面積化も可能になった。開発したパイ遷移ジョセフソン接合を含む回路の解析ができる回路シミュレータは公開し、国内外の研究者に利用されている。

Research Products

• [Journal Article] Compact Superconducting Lookup Table Composed of Two-Dimensional Memory Cell Array Reconfigured by External DC Control Currents (2021)
  • Author(s): Hosoya Takuya、Yamanashi Yuki、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 31 Issue: 3 Pages: 1-6
  • DOI: 10.1109/tasc.2021.3049771
• [Journal Article] Demonstration of an efficient single flux quantum logic circuit by introducing a local magnetic flux biasing (2021)
  • Author(s): Asada Shunta、Yamanashi Yuki、Yoshikawa Nobuyuki
  • Journal Title: Superconductor Science and Technology Volume: 34 Issue: 5 Pages: 055007-055007
  • DOI: 10.1088/1361-6668/abf23a
• [Journal Article] Simulation of the Margins in Single Flux Quantum Circuits Containing π-Shifted Josephson Junctions (2019)
  • Author(s): Yamanashi Yuki、Nakaishi Sotaro、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 29 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2019.2904700
  • NAID: 120006606657
• [Journal Article] Study on Single Flux Quantum Floating-Point Divider Based on Goldschmidt's Algorithm (2019)
  • Author(s): Sanada Akiyoshi、Yamanashi Yuki、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 29 Issue: 5 Pages: 1-4
  • DOI: 10.1109/tasc.2019.2902800
  • NAID: 120006606658
  • Peer Reviewed
• [Journal Article] Miniaturization of adiabatic quantum-flux-parametron circuits by adopting offset buffers (2019)
  • Author(s): Okuma Yukihiro、Takeuchi Naoki、Yamanashi Yuki、Yoshikawa Nobuyuki
  • Journal Title: Superconductor Science and Technology Volume: 32 Issue: 6 Pages: 065007-065007
  • DOI: 10.1088/1361-6668/ab1672
  • Peer Reviewed
• [Journal Article] Demonstration of Picosecond Time Resolution in Double-Oscillator Time-to-Digital Converter Using Single-Flux-Quantum Circuits (2019)
  • Author(s): Tomitsuka Yuma、Yamanashi Yuki、Zen Nobuyuki、Ohkubo Masataka、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 29 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2019.2902478
  • Peer Reviewed / Open Access
• [Journal Article] Design methodology of single-flux-quantum flip-flops composed of both 0- and π-shifted Josephson junctions (2018)
  • Author(s): Yamanashi Yuki、Nakaishi Sotaro、Sugiyama Akira、Takeuchi Naoki、Yoshikawa Nobuyuki
  • Journal Title: Superconductor Science and Technology Volume: 31 Issue: 10 Pages: 105003-105003
  • DOI: 10.1088/1361-6668/aad78d
  • NAID: 120006501249
  • Peer Reviewed / Open Access
• [Journal Article] Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation (2018)
  • Author(s): Yamanashi Yuki、Imai Hibiki、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 28 Issue: 7 Pages: 1-5
  • DOI: 10.1109/tasc.2018.2836971
  • NAID: 120006477601
  • Peer Reviewed
• [Journal Article] A random-access-memory cell based on quantum flux parametron with three control lines (2018)
  • Author(s): Takayama Hiroshi、Takeuchi Naoki、Yamanashi Yuki、Yoshikawa Nobuyuki
  • Journal Title: Journal of Physics: Conference Series Volume: 1054 Pages: 012063-012063
  • DOI: 10.1088/1742-6596/1054/1/012063
  • Peer Reviewed
• [Presentation] CMOS回路の電流出力による再構成が可能な64-bit単一磁束量子ルックアップテーブルの動作実証 (2021)
  • Author(s): 弘中 祐樹, 細谷 岳哉, 山梨 裕希, 吉川 信行
  • Organizer: 応用物理学会春季学術講演会
• [Presentation] ジョセフソン発振回路の周波数同期化現象” 応用物理学会春季学術講演会 (2021)
  • Author(s): 山梨 裕希, 木下 諒, 吉川 信行
  • Organizer: 応用物理学会春季学術講演会
• [Presentation] 直流電流の印加による再構成が可能な単一磁束量子ルックアップテーブルの小型化と動作実証 (2021)
  • Author(s): 細谷岳哉, 山梨裕希, 吉川信行
  • Organizer: 低温工学・超電導学会研究発表会
• [Presentation] 局地磁束バイアスを用いた単一磁束量子メモリシステムの設計と動作検証 (2021)
  • Author(s): 浅田峻汰, 山梨裕希, 吉川信行
  • Organizer: 低温工学・超電導学会研究発表会
• [Presentation] 局地磁束バイアスを用いた超伝導単一磁束量子メモリシステムの設計 (2021)
  • Author(s): 浅田峻汰, 山梨裕希, 吉川信行
  • Organizer: 応用物理学会秋季学術講演会
• [Presentation] 直流電流の印加によってデータの書き換えが可能な単一磁束量子メモリセルの小型化 (2021)
  • Author(s): 細谷岳哉, 山梨裕希, 吉川信行
  • Organizer: 応用物理学会秋季学術講演会
• [Presentation] Demonstration of neurons with sigmoidal activation functions for superconducting neural networks (2020)
  • Author(s): D. Yamaguchi, Y. Yamanashi, and N. Yoshikawa
  • Organizer: International Symposium on Superconductivity (ISS) 2020
  • Int'l Joint Research
• [Presentation] Experimental evaluation of gray zone width of quantum flux parametron implemented by circuit fabrication processes with different critical current density (2020)
  • Author(s): Y. Yamanashi, Y. Tsuna, and N. Yoshikawa
  • Organizer: Applied Superconductivity Conference (ASC) 2020
  • Int'l Joint Research
• [Presentation] Design of high-density single flux quantum look-up table composed of memory cells reconfigured by external dc control currents (2020)
  • Author(s): T. Hosoya, Y. Yamanashi, and N. Yoshikawa
  • Organizer: Applied Superconductivity Conference (ASC) 2020
  • Int'l Joint Research
• [Presentation] Implementation of energy- and area- efficient single flux quantum circuit by introducing local flux magnetic flux bias technique (2020)
  • Author(s): S. Asada, Y. Yamanashi, and Yoshikawa
  • Organizer: Applied Superconductivity Conference (ASC) 2020
  • Int'l Joint Research
• [Presentation] Performance Improvement of Superconducting Circuit by Introducing pi-Shifted Josephson Junctions (2019)
  • Author(s): Y. Yamanashi
  • Organizer: 32nd International Superconductivity Symposium
  • Int'l Joint Research / Invited
• [Presentation] Measurement of Single-Flux-Quantum Floating-Point Divider Based on Goldschmidt's Algorithm (2019)
  • Author(s): Y. Yamanashi, A. Sanada, and N. Yoshikawa
  • Organizer: International Superconductive Electronics Conference (ISEC) 2019
• [Presentation] Investigation of the effects of 1/f noise on superconducting circuits (2019)
  • Author(s): Y. Tsuna, Y. Yamanashi, and N. Yoshikawa
  • Organizer: International Superconductive Electronics Conference (ISEC) 2019
  • Int'l Joint Research
• [Presentation] Single-Flux-Quantum Parallel Multiplier Using Accumulator Unit (2019)
  • Author(s): Z. Li, Y. Yamanashi, and N. Yoshikawa
  • Organizer: 32nd International Superconductivity Symposium
  • Int'l Joint Research
• [Presentation] Numerical and Experimental Analysis of Influences of 1/ f noises on Superconducting Integrated Circuits (2019)
  • Author(s): Y. Tsuna, Y. Yamanashi, and N. Yoshikawa
  • Organizer: 32nd International Superconductivity Symposium
  • Int'l Joint Research
• [Presentation] 超伝導回路の動作安定度に対する1/f雑音の影響の解析と評価 (2019)
  • Author(s): 津名 宥佑，山梨 裕希 , 吉川 信行
  • Organizer: 応用物理学会秋季学術講演会
• [Presentation] 外部からの磁束印可によるデータ入力が可能な単一磁束量子メモリセルの設計とルックアップテーブルへの応用 (2019)
  • Author(s): 細谷 岳哉, 山梨 裕希, 吉川 信行
  • Organizer: 応用物理学会秋季学術講演会
• [Presentation] 局地磁束バイアスを用いた超伝導単一磁束量子論理ゲートの動作実証 (2019)
  • Author(s): 浅田峻汰, 山梨裕希 , 吉川信行
  • Organizer: 応用物理学会春季学術講演会
• [Presentation] 外部磁束印可によってデータの再構成が可能なメモリセルを用いた単一磁束量子ルックアップテーブルの動作実証 (2019)
  • Author(s): 細谷岳哉, 山梨裕希, 吉川信行
  • Organizer: 応用物理学会春季学術講演会
• [Presentation] パイ遷移ジョセフソン接合を用いた二線式超伝導単一磁束量子論理ゲートの設計 (2019)
  • Author(s): 小原佑亮, 山梨裕希, 吉川信行
  • Organizer: 電子情報通信学会総合大会
• [Presentation] Evaluation of Single Flux Quantum Flip-Flops Containing p-Shifted Josephson Junctions (2018)
  • Author(s): Y. Yamanashi, S. Nakaishi, and N. Yoshikawa
  • Organizer: Applied Superconductivity Conference (ASC) 2018
  • Int'l Joint Research / Invited
• [Presentation] Study on Single Flux Quantum Floating-Point Divider Based on a Goldschmidt’s Algorithm (2018)
  • Author(s): A. Sanada, Y. Yamanashi, and N. Yoshikawa
  • Organizer: Applied Superconductivity Conference (ASC) 2018
  • Int'l Joint Research
• [Presentation] Superconducting Digital Data Processing Circuits for Astronomical Applications (2018)
  • Author(s): Y. Yamanashi
  • Organizer: 19th East Asia Sub-millimeter-wave Receiver Technology Workshop 5th Riken-NICT Joint Workshop on Terahertz Technology
  • Int'l Joint Research / Invited
• [Presentation] Simulation of superconductor circuit operation considering 1/f noises (2018)
  • Author(s): Y. Tsuna, Y. Yamanashi, and N. Yoshikawa
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV2019)
  • Int'l Joint Research
• [Presentation] Investigation of Superconducting Neural Network Realizing Arbitrary Logic Function (2018)
  • Author(s): D. Yamaguchi, Y. Yamanashi, and N. Yoshikawa
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV2019)
  • Int'l Joint Research
• [Presentation] 局地磁束バイアスを用いた超伝導単一磁束量子回路の設計と評価 (2018)
  • Author(s): 浅田峻汰，山梨裕希，吉川信行
  • Organizer: 応用物理学会春季学術講演会
• [Presentation] 磁束量子パラメトロンを用いた超伝導ニューラルネットワークによる任意出力可能な論理ゲートの設計と評価 (2018)
  • Author(s): 山口大貴, 山梨裕希, 竹内尚輝, 吉川信行
  • Organizer: 応用物理学会春季学術講演会