Study on programmable adiabatic superconductor circuits using magnetic Josephson junctions

• Project/Area Number: 18H01493
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Yokohama National University
• Principal Investigator: Takeuchi Naoki 横浜国立大学, 先端科学高等研究院, 特任教員(准教授) (00746472)
• Co-Investigator(Kenkyū-buntansha): 山下 太郎 名古屋大学, 工学研究科, 准教授 (60567254)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2019: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000); Fiscal Year 2018: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
• Keywords: 断熱磁束量子パラメトロン / π接合 / 超伝導エレクトロニクス / 磁性ジョセフソン接合 / プログラマブル / 低電力 / 超伝導集積回路 / 磁束量子パラメトロン / 超伝導回路 / ジョセフソン接合 / 磁性体 / 超伝導ディジタル回路 / 断熱ロジック

Outline of Final Research Achievements

This study aims to achieve programmable superconductor circuits by introducing π junctions to adiabatic quantum-flux-parametron (AQFP); a π junction is a magnetic Josephson junction, and AQFP is low-power superconductor logic. We have established fabrication technology for introducing π junctions to AQFP circuits, established a simulation method for AQFP circuits with π junctions, developed programmable AQFP circuits that utilize π junction-based memories, and demonstrated the programmable AQFP circuits at low temperature. Consequently, we have succeeded in achieving programmable superconductor circuit technology.

Academic Significance and Societal Importance of the Research Achievements

本研究により、プログラマブル超伝導回路の基盤技術が確立された。同回路は、低電力超伝導ロジックAQFPで構成されるため、極めて小さな消費電力で動作可能であり、将来的に超低電力FPGAに応用できると考えられる。また、このような超低電力FPGAは、スーパーコンピュータ、データセンター、最適化問題ソルバ等の様々なシステムの消費エネルギーの低減に貢献し、未来の情報社会を支える集積回路技術になると期待できる。

Research Products

• [Journal Article] Magnetic Josephson Junctions: New Phenomena and Physics with Diluted Alloy, Conventional Ferromagnet, and Multilayer Barriers (2021)
  • Author(s): Yamashita Taro
  • Journal Title: IEICE Transactions on Electronics Volume: E104.C Issue: 9 Pages: 422-428
  • DOI: 10.1587/transele.2020SUI0004
  • NAID: 130008082175
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2021-09-01
  • Peer Reviewed / Open Access
• [Journal Article] Impedance Design of Excitation Lines in Adiabatic Quantum-Flux-Parametron Logic Using InductEx (2021)
  • Author(s): Takeuchi Naoki、Suzuki Hideo、Fourie Coenrad J.、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 31 Issue: 5 Pages: 1300605-1300605
  • DOI: 10.1109/tasc.2021.3058080
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Design and Demonstration of Directly Coupled Quantum-Flux-Parametron Circuits With Optimized Parameters (2021)
  • Author(s): Ishida Ryohei、Takeuchi Naoki、Yamae Taiki、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 31 Issue: 5 Pages: 1100505-1100505
  • DOI: 10.1109/tasc.2021.3059723
  • Peer Reviewed
• [Journal Article] Directly coupled adiabatic superconductor logic (2020)
  • Author(s): Takeuchi Naoki、Arai Kota、Yoshikawa Nobuyuki
  • Journal Title: Superconductor Science and Technology Volume: 33 Issue: 6 Pages: 065002-065002
  • DOI: 10.1088/1361-6668/ab87ad
  • Peer Reviewed / Open Access
• [Journal Article] π phase shifter based on NbN-based ferromagnetic Josephson junction on a silicon substrate (2020)
  • Author(s): Yamashita Taro、Kim Sunmi、Kato Haruki、Qiu Wei、Semba Kouichi、Fujimaki Akira、Terai Hirotaka
  • Journal Title: Scientific Reports Volume: 10 Issue: 1 Pages: 13687-13687
  • DOI: 10.1038/s41598-020-70766-9
  • Peer Reviewed / Open Access
• [Journal Article] Systematic method to evaluate energy dissipation in adiabatic quantum-flux-parametron logic (2019)
  • Author(s): Yamae Taiki、Takeuchi Naoki、Yoshikawa Nobuyuki
  • Journal Title: Journal of Applied Physics Volume: 126 Issue: 17 Pages: 173903-173903
  • DOI: 10.1063/1.5119306
  • NAID: 120006786475
  • Peer Reviewed
• [Journal Article] Low-latency adiabatic superconductor logic using delay-line clocking (2019)
  • Author(s): Takeuchi Naoki、Nozoe Mai、He Yuxing、Yoshikawa Nobuyuki
  • Journal Title: Applied Physics Letters Volume: 115 Issue: 7 Pages: 072601-072601
  • DOI: 10.1063/1.5111599
  • Peer Reviewed
• [Journal Article] Adiabatic quantum-flux-parametron with π Josephson junctions (2019)
  • Author(s): Arai Kota、Takeuchi Naoki、Yamashita Taro、Yoshikawa Nobuyuki
  • Journal Title: Journal of Applied Physics Volume: 125 Issue: 9 Pages: 093901-093901
  • DOI: 10.1063/1.5080467
  • Peer Reviewed
• [Journal Article] Fabrication Technologies for Superconducting Quantum Circuits for Large-scale Quantum Computing (2018)
  • Author(s): 寺井 弘高, 丘 偉, 山下 太郎
  • Journal Title: TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Volume: 53 Issue: 5 Pages: 295-305
  • DOI: 10.2221/jcsj.53.295
  • NAID: 130007500596
  • ISSN: 0389-2441, 1880-0408
  • Year and Date: 2018-08-20
  • Peer Reviewed / Open Access
• [Journal Article] Phase Shift and Control in Superconducting Hybrid Structures (2018)
  • Author(s): T. Yamashita
  • Journal Title: IEICE Transactions on Electronics Volume: E101.C Issue: 5 Pages: 378-384
  • DOI: 10.1587/transele.E101.C.378
  • NAID: 130006729729
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2018-05-01
  • Peer Reviewed
• [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
• [Presentation] 断熱磁束量子パラメトロンによる超低電力コンピューティング (2021)
  • Author(s): 竹内 尚輝
  • Organizer: 2021年電子情報通信学会総合大会
  • Invited
• [Presentation] Impedance design of excitation lines in adiabatic quantum-flux-parametron logic using InductEx (2021)
  • Author(s): N. Takeuchi, H. Suzuki, C. J. Fourie, and N. Yoshikawa
  • Organizer: Applied Superconductivity Conference 2020 (ASC 2020)
  • Int'l Joint Research
• [Presentation] NbN-based Josephson junction with PdNi-ferromagnetic barrier (2021)
  • Author(s): Duong Pham, Riku Sugimoto, Hayate Nakamura, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: American Physical Society (APS) March Meeting
  • Int'l Joint Research
• [Presentation] 断熱磁束量子パラメトロン ―様々な情報システムへの応用と今後の展望― (2020)
  • Author(s): 竹内 尚輝
  • Organizer: 日本学術振興会超伝導エレクトロニクス第146委員会・合同分科会
  • Invited
• [Presentation] Design and demonstration of directly-coupled quantum-flux-parametron circuits with optimized circuit parameters (2020)
  • Author(s): R. Ishida, N. Takeuchi, and N. Yoshikawa
  • Organizer: Applied Superconductivity Conference 2020 (ASC 2020)
  • Int'l Joint Research
• [Presentation] 直結式量子磁束パラメトロン回路における配線長の改善 (2020)
  • Author(s): 石田 椋平, 竹内 尚輝, 山栄 大樹, 吉川 信行
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] 最適回路パラメータを用いた直結式量子磁束パラメトロン回路の動作実証 (2020)
  • Author(s): 石田 椋平, 竹内 尚輝, 山栄 大樹, 吉川 信行
  • Organizer: 2020年度春季低温工学・超電導学会
• [Presentation] Fabrication of Magnetic Josephson Junctions on Nb 4-layer Structure for Large Scale Half Flux Quantum Circuits (2020)
  • Author(s): Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop (SSV 2020)
  • Int'l Joint Research
• [Presentation] Adiabatic Quantum-Flux-Parametron: Recent Progress and Applications (2020)
  • Author(s): N. Takeuchi, C. L. Ayala, O. Chen, Y. He, and N. Yoshikawa
  • Organizer: 13th Superconducting SFQ VLSI Workshop (SSV2020)
  • Int'l Joint Research / Invited
• [Presentation] Parameter optimization of directly coupled quantum flux parametron circuits (2020)
  • Author(s): R. Ishida, N. Takeuchi, and N. Yoshikawa
  • Organizer: 13th Superconducting SFQ VLSI Workshop (SSV2020)
  • Int'l Joint Research
• [Presentation] Magnetic Josephson junctions on Nb four-layer structure for half flux quantum circuits (2019)
  • Author(s): Daiki Hasegawa, Yuto Takeshita, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 17th International Superconductive Electronics Conference (ISEC 2019)
  • Int'l Joint Research
• [Presentation] Adiabatic quantum-flux-parametron: recent progress and possibility for quantum applications (2019)
  • Author(s): N. Takeuchi, C. L. Ayala, O. Chen, Y. He, and N. Yoshikawa
  • Organizer: 1st workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2019)
  • Int'l Joint Research
• [Presentation] Low-latency adiabatic quantum-flux-parametron using delay-line clocking (2019)
  • Author(s): N. Takeuchi, M. Nozoe, Y. He, and N. Yoshikawa
  • Organizer: 17th International Superconductive Electronics Conference (ISEC 2019)
  • Int'l Joint Research
• [Presentation] 強磁性ジョセフソン接合と量子回路応用 (2019)
  • Author(s): 山下太郎
  • Organizer: 日本物理学会第74回年次大会（2019年）
• [Presentation] Inverting quantum flux parametron as adiabatic superconductor logic without transformers (2018)
  • Author(s): K. Arai, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
  • Organizer: The Applied Superconductivity Conference 2018 (ASC 2018)
  • Int'l Joint Research
• [Presentation] 反転型量子磁束パラメトロンを用いたマイノリティゲートの動作実証 (2018)
  • Author(s): 荒井 孝太, 竹内 尚輝, 山梨 裕希, 吉川 信行
  • Organizer: 2018年電子情報通信学会ソサイエティ大会
• [Presentation] 反転型磁束量子パラメトロンを用いた論理回路の動作実証 (2018)
  • Author(s): 荒井 孝太, 竹内 尚輝, 山梨 裕希, 吉川 信行
  • Organizer: 電子情報通信学会超伝導エレクトロニクス研究会SCE2018
• [Presentation] Development of pi-shift superconducting flux qubits (2018)
  • Author(s): T. Yamashita
  • Organizer: 13th International Workshop on Low Temperature Electronics (WOLTE 13)
  • Int'l Joint Research / Invited
• [Presentation] NbN-based ferromagnetic Josephson junctions for π-shift superconducting flux qubits (2018)
  • Author(s): T. Yamashita, A. Kawakami, H. Terai, and A. Fujimaki
  • Organizer: The Applied Superconductivity Conference 2018 (ASC 2018)
  • Int'l Joint Research
• [Patent(Industrial Property Rights)] 磁束バイアス回路 (2021)
  • Inventor(s): 竹内 尚輝, 吉川 信行, 橋本 義仁, 山本 剛, 平山 文紀
  • Industrial Property Rights Holder: 横浜国立大学, 日本電気, 産業技術総合研究所
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2021-068575
  • Filing Date: 2021