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Research on ultra-low power sub-terahertz superconducting quantum digital systems based on pulse-driven circuits

Research Project

Project/Area Number 18H05211
Research Category

Grant-in-Aid for Specially Promoted Research

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionNagoya University

Principal Investigator

藤巻 朗  名古屋大学, 工学研究科, 教授 (20183931)

Co-Investigator(Kenkyū-buntansha) 高木 直史  京都大学, 情報学研究科, 教授 (10171422)
牧瀬 圭正  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 特定フェロー (60363321)
山下 太郎  名古屋大学, 工学研究科, 准教授 (60567254)
吉川 信行  横浜国立大学, 大学院工学研究院, 教授 (70202398)
Project Period (FY) 2018-04-23 – 2023-03-31
Project Status Granted (Fiscal Year 2022)
Budget Amount *help
¥615,420,000 (Direct Cost: ¥473,400,000、Indirect Cost: ¥142,020,000)
Fiscal Year 2022: ¥78,130,000 (Direct Cost: ¥60,100,000、Indirect Cost: ¥18,030,000)
Fiscal Year 2021: ¥89,180,000 (Direct Cost: ¥68,600,000、Indirect Cost: ¥20,580,000)
Fiscal Year 2020: ¥131,560,000 (Direct Cost: ¥101,200,000、Indirect Cost: ¥30,360,000)
Fiscal Year 2019: ¥176,540,000 (Direct Cost: ¥135,800,000、Indirect Cost: ¥40,740,000)
Fiscal Year 2018: ¥140,010,000 (Direct Cost: ¥107,700,000、Indirect Cost: ¥32,310,000)
Keywords単一磁束量子回路 / 半磁束量子 / 磁性ジョセフソン接合 / 単一磁束量子 / パルス論理 / π接合 / 半磁束量子回路 / パルス駆動回路 / 磁束量子回路 / 超伝導回路
Outline of Annual Research Achievements

2022年度は、当初計画に沿って、大きく3つの課題について研究を進めてきた。1つはパルス駆動の高速マイクロプロセッサの開発である。具体的には、単一磁束量子回路を用いて、8ビット並列のマイクロプロセッサの実証を進めた。世界で本研究グループのみが、ビット並列で50GHz以上の動作速度での大規模集積回路の実績を持つが、マイクロプロセッサは各機能ブロック間で処理速度が異なり、各ブロック間のデータのやりとりが極めて複雑になる。加えて、データパスは50GHz以上で動かす必要があることから、設計において最も難易度が高い。精緻な信号伝搬の遅延時間の制御法を確立ことで、64GHzまでの命令実行を確認した。なお、設計技術に関しては、各論理ゲートに到来する信号のタイミングのよりいっそうの厳密制御をサポートするため、様々な論理ゲートを含む回路を対象とする静的タイミング解析ツールを開発するとともに、レイアウトエディタによる配線環境の整備を行った。
2つ目の課題は、磁性接合によるパルス駆動のマトリクスメモリを中心とする半磁束量子回路の実証に関するものである。磁性接合を世界で唯一安定に形成する技術を有しており、この技術をベースにパルス駆動マトリクスメモリの解析や開発を進めた。論理値0と1の状態間に存在するエネルギー障壁をパルスの持つエネルギー10zJオーダーで制御することに成功し、ワード線とビット線で選ばれたところの記憶セルの書込みや読出しに成功している。なお、このメモリとマイクロプロセッサを将来は3次元実装する必要がある。これまで、マルチチップ構造においてパルスのチップ間伝送特性を測定し、120GHzでの伝送を確認している。
3つ目の課題は、量子限界に近い環境での半磁束量子回路の動作の実証である。この目的のために、独自の半磁束量子回路用プロセスを開発し、トグルフリップフロップの動作を確認した。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

前述のように、3つの課題について、おおむね順調に研究は推移した。8ビットマイクロプロセッサの50GHzを超える実証は、超伝導デジタル回路の研究の集大成ともいえる成果であり、今後はこの処理速度に合うシステムの検討の段階に入っていくものと考える。また、この過程で開発された設計法あるいはCAD技術は、極めて信頼性が高く、世界的な標準となる可能性を秘めている。
システムにおいて、もう一つの重要な要素がメモリの階層構造である。本研究で研究開発を進めるパルス駆動型のメモリは、他の技術では実現し得ない高速マトリクスメモリを構築し得る。これは、メモリの内部状態の変更をインパルスで行うことができるようにした結果であり、すべてのマトリクスメモリにおいて高速化の障害となっていた記憶セル選択のためのワード線やビット線における充放電現象を回避している。現時点での試算では、少なくとも10GHzを超える周波数で信号の入力、読出しが可能となっている。今後はマイクロプロセッサと同じ周波数で動くレジスタファイル、さらなる大容量が必要な主記憶との整合性の検討が求められる。
2021年度下期以降ついては、試作を担う産総研でのクリーンルーム改修が行われ、実証実験が困難となっている。これに対応するため、名古屋大学内だけで独自に半磁束量子回路や単一磁束量子回路の小規模回路を形成するプロセスを立ち上げた。この技術により、極低温での回路の検証も進められている。
このほか、半磁束量子回路の基本デバイスである0-π SQUIDが、高い比透磁率材として振る舞うことを見出した。2021年度は、この実験もスタートしている。

Strategy for Future Research Activity

2022年度は研究期間の最終年度とあっており、当初計画通り、これまで開発して来た全ての技術の集結を図る。具体的な開発項目としては、開発して来たマイクロプロセッサとパルス駆動メモリの3次元実装による評価となる。この評価を通して、数十GHzを超えるパルス駆動回路の設計法、回路構成法、広帯域マルチチップモジュールの課題の抽出ならびにその解決/回避方法の確立を目指す。
上記の目標の障害となっているのが、パルス駆動マトリクスメモリの大規模化である。現在は課題解決の方法を数値計算等の解析で進めており、産総研のクリーンルームの改修が終了し次第、実際の試作に取り組む。
本研究では、半磁束量子回路の20mK程度の極低温での動作検証も行うこととしている。この温度では、熱的な揺らぎを抑制することができ、信号となるパルスのエネルギー・時間半値幅の積がプランク定数の10倍程度に設定することも可能である。すなわち、古典的な演算回路が量子限界に近い領域でどのような振る舞いをするのかを、実際の回路で調べることが可能となる。幸い2021年度に確立した名古屋大学での作成プロセスを用いることで、この研究を実施することが可能である。この研究を通して、古典計算の熱力学的限界、量子力学的限界での振る舞いを明らかとする。
上記に加え、0-π SQUIDは物理的にも工学的にも興味深い振る舞いをすることが期待される。まずは系統的な調査により、透磁率増大効果などの性質を明らかにする。

Assessment Rating
Interim Assessment Comments (Rating)

A: In light of the aim of introducing the research area into the research categories, the expected progress has been made in research.

Report

(8 results)
  • 2021 Annual Research Report
  • 2020 Abstract (Interim Assessment) ( PDF )   Annual Research Report   Interim Assessment (Comments) ( PDF )
  • 2019 Annual Research Report
  • 2018 Abstract ( PDF )   Comments on the Screening Results ( PDF )   Annual Research Report

Research Products

(163 results)

All 2022 2021 2020 2019 2018

All Journal Article (23 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 23 results,  Open Access: 3 results) Presentation (136 results) (of which Int'l Joint Research: 82 results,  Invited: 19 results) Funded Workshop (4 results)

  • [Journal Article] Logic-Depth-Aware Technology Mapping Method for RSFQ Logic Circuits With Special RSFQ Gates2022

    • Author(s)
      KITO, Nobutaka、TAKAGI, Kazuyoshi、TAKAGI, Naofumi
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 32 Pages: 1-5

    • DOI

      10.1109/tasc.2021.3129719

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-speed memory driven by SFQ pulses based on 0-π SQUID2021

    • Author(s)
      Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31-5 Pages: 1100906-1100906

    • DOI

      10.1109/tasc.2021.3060351

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Demonstration of Interface Circuits Between Half- and Single- Flux- Quantum Circuits2021

    • Author(s)
      Hasegawa Daiki、Takeshita Yuto、Li Feng、Sano Kyosuke、Tanaka Masamitsu、Yamashita Taro、Fujimaki Akira
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Pages: 1-4

    • DOI

      10.1109/tasc.2021.3072846

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 64-GHz datapath demonstration for bit-parallel SFQ microprocessors based on a gate-level-pipeline structure2021

    • Author(s)
      Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31-5 Pages: 1301006-1301006

    • DOI

      10.1109/tasc.2021.3061353

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Demonstration of a 52-GHz Bit-Parallel Multiplier Using Low-Voltage Rapid Single-Flux-Quantum Logic2021

    • Author(s)
      I. Nagaoka, K. Ishida, M. Tanaka, K. Sano, T. Yamashita, T. Ono, K. Inoue, and A. Fujimaki
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: TBD Pages: 1-5

    • DOI

      10.1109/tasc.2021.3071996

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Investigation of Timing Parameters in Single-Flux-Quantum Circuits Using Low Critical-Current Junctions and Low Bias Voltages2021

    • Author(s)
      M. Kuniyoshi, K. Murase, I. Nagaoka, K. Sano, M. Tanaka, T. Yamashita, and A. Fujimaki
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Pages: 1101405-1101405

    • DOI

      10.1109/tasc.2021.3067827

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synchronous SFQ Address Encoder for Superconductor Detector Arrays2021

    • Author(s)
      Bozbey Ali, Aydogan Eren, Usenmez Kubra, Razmkhah Sasan, Tanaka Masamitsu, Fujimaki Akira
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Pages: 1300106-1300106

    • DOI

      10.1109/tasc.2021.3065000

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Planarized Nb 4-Layer Fabrication Process for Superconducting Integrated Circuits and Its Fabricated Device Evaluation2021

    • Author(s)
      NAGASAWA Shuichi、TANAKA Masamitsu、TAKEUCHI Naoki、YAMANASHI Yuki、MIYAJIMA Shigeyuki、CHINA Fumihiro、YAMAE Taiki、YAMAZAKI Koki、SOMEI Yuta、SEGA Naonori、MIZUGAKI Yoshinao、MYOREN Hiroaki、TERAI Hirotaka、HIDAKA Mutsuo、YOSHIKAWA Nobuyuki、FUJIMAKI Akira
    • Journal Title

      IEICE Trans. Electron.

      Volume: E104.C Issue: 9 Pages: 435-445

    • DOI

      10.1587/transele.2020sup0001

      10.1587/transele.2020SUP0001

    • NAID

      130008082182

    • ISSN
      0916-8524, 1745-1353
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fabrication Process for Superconducting Digital Circuits2021

    • Author(s)
      Mutsuo Hidaka and Shuichi Nagasawa
    • Journal Title

      IEICE Trans. Electron.

      Volume: E-104C Issue: 9 Pages: 405-410

    • DOI

      10.1587/transele.2020sui0002

      10.1587/transele.2020SUI0002

    • NAID

      130008082178

    • ISSN
      0916-8524, 1745-1353
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Rapid Single-Flux-Quantum Logic Circuits Using Clockless Gates2021

    • Author(s)
      Kawaguchi Takahiro、Takagi Kazuyoshi、Takagi Naofumi
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Pages: 1-7

    • DOI

      10.1109/tasc.2021.3068960

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Timing Fault Model and an Efficient Timing Fault Simulation Method for Rapid Single-Flux-Quantum Logic Circuits2021

    • Author(s)
      NAKAMURA, Shogo、TAKAGI, Kazuyoshi、KITO, Nobutaka、TAKAGI, Naofumi
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1975 Pages: 012026-012026

    • DOI

      10.1088/1742-6596/1975/1/012026

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Low-power high-speed half-flux-quantum circuits driven by low bias voltages2021

    • Author(s)
      Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
    • Journal Title

      Superconductor Science and Technology

      Volume: 34-2 Pages: 025013-025013

    • DOI

      10.1088/1361-6668/abcaac

    • NAID

      120007145973

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Demonstration of a 47.8 GHz High-Speed FFT Processor Using Single-Flux-Quantum Technology2021

    • Author(s)
      Fei Ke, Olivia Chen, Yanzhi Wang and Nobuyuki Yoshikawa
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31-5 Pages: 1-5

    • DOI

      10.1109/tasc.2021.3059984

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A Two-Step Routing Method with Wire Length Budgeting for PTL Routing of SFQ Logic Circuits2020

    • Author(s)
      Kei Kitamura, Kazuyoshi Takagi, and Naofumi Takagi
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1590 Pages: 012043-012043

    • DOI

      10.1088/1742-6596/1590/1/012043

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conversion Method of Netlists Consisting of Conventional Logic Gates to RSFQ Logic Circuits Utilizing Special RSFQ Gates2020

    • Author(s)
      Kito Nobutaka、Takagi Kazuyoshi、Takagi Naofumi
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 30 Pages: 1302306-1302306

    • DOI

      10.1109/tasc.2020.3012474

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Layout Design Flow for RSFQ Circuits Based on Cell Clustering and Mixed Wiring of JTLs and PTLs2020

    • Author(s)
      Takashi Dejima, Kazuyoshi Takagi, and Naofumi Takagi
    • Journal Title

      IEEE Trans. Appl. Supercond.

      Volume: 30-7 Pages: 1302506-1302506

    • DOI

      10.1109/tasc.2020.3014928

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fundamental study on the nanocryotron properties by the numerical calculation2019

    • Author(s)
      Masumi Inoue, Kazuki Izaki, Yuki Goto, Kyosuke Sano, Taro Yamashita, Masamitsu Tanaka, Akira Fujimaki
    • Journal Title

      EEE Trans. Appl. Supercond.

      Volume: 29

    • DOI

      10.1109/tasc.2019.2904585

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fabrication of NbTiN Josephson junctions with thermally oxidized Hf tunnel barriers2019

    • Author(s)
      H. Akaike、K. Munemoto、Y. Sakakibara、A. Fujimaki
    • Journal Title

      IEEE Trans. Appl. Supercond.

      Volume: 29 Pages: 1102605-1102605

    • DOI

      10.1109/tasc.2019.2906278

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Demonstration of a Superconducting Nanowire Single-Photon Detector using Adiabatic Quantum-Flux-Parametron Logic in a 0.1-W Gifford-McMahon Cryocooler2019

    • Author(s)
      Takeuchi Naoki、Yamashita Taro、Miyajima Shigeyuki、Miki Shigehito、Yoshikawa Nobuyuki、Terai Hirotaka
    • Journal Title

      IEEE Trans. Appl. Supercond.

      Volume: 29 Pages: 2201004-2201008

    • DOI

      10.1109/tasc.2019.2902771

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Boosting the secret key rate in a shared quantum and classical fibre communication system2019

    • Author(s)
      Davide Bacco, *Beatrice Da Lio, Daniele Cozzolino, Francesco Da Ros, Xueshi Guo, Yunhong Ding, Yusuke Sasaki, Kazuhiko Aikawa, Shigehito Miki, Hirotaka Terai, Taro Yamashita 外 6名
    • Journal Title

      Communications Physics

      Volume: 2

    • DOI

      10.1038/s42005-019-0238-1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Thermally Assisted Superconductor Transistors for Josephson-CMOS Hybrid Memories2018

    • Author(s)
      K. Sano, M. Suzuki, K. Maruyama, S. Taniguchi, M. Tanaka, A Fujimaki, M. Inoue, N. Yoshikawa
    • Journal Title

      IEICE Trans. Electron.

      Volume: E101-C (5) Issue: 5 Pages: 370-377

    • DOI

      10.1587/transele.e101.c.370

      10.1587/transele.E101.C.370

    • NAID

      130006729728

    • ISSN
      0916-8524, 1745-1353
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Energy/Space-Efficient Rapid Single-Flux-Quantum Circuits by Using <i>π</i>-Shifted Josephson Junctions2018

    • Author(s)
      T. Kamiya, M. Tanaka, K. Sano, A. Fujimaki
    • Journal Title

      IEICE Trans. Electron.

      Volume: E101-C (5) Issue: 5 Pages: 385-390

    • DOI

      10.1587/transele.e101.c.385

      10.1587/transele.E101.C.385

    • NAID

      130006729704

    • ISSN
      0916-8524, 1745-1353
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 超伝導単一磁束量子回路による50 GHzビット並列演算マイクロプロセッサに向けた要素回路設計2018

    • Author(s)
      田中雅光, 佐藤諒, 石田浩貴, 畑中湧貴, 松井裕一, 小野貴継, 井上弘士, 藤巻朗
    • Journal Title

      電子情報通信学会論文誌C

      Volume: 101-C (10) Pages: 389-399

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] π-π-π SQUIDs: The Switching Element of HFQ Circuits Operating at mK2022

    • Author(s)
      Feng Li, Pham Duong, Yuto Takeshita, Kento Kato, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Half-flux-quantum circuits using π-shifted ferromagnetic junctions2021

    • Author(s)
      Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      34th International Symposium on Superconductivity (ISS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Implementation of a High-Throughput Bit-Parallel Microprocessor Using Single-Flux-Quantum Logic2021

    • Author(s)
      Ikki Nagaoka, Ryota Kashima, Tomoki Nakano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      15th European Conference on Applied Superconductivity (EUCAS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Demonstration of half-flux-quantum T-flip flops made up with only π junctions2021

    • Author(s)
      Feng Li, Yuto Takeshita, Kento Kato, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      15th European Conference on Applied Superconductivity (EUCAS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of π-phase shift in NbN-based Josephson junctions with Pd89 Ni11 ferromagnetic interlayers2021

    • Author(s)
      Pham Duong, Riku Sugimoto, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      15th European Conference on Applied Superconductivity (EUCAS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of impulse-driven, high-speed memories based on 0-π SQUIDs2021

    • Author(s)
      Yuto Takeshita, Hinata Fujisawa, Kento Kato, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      15th European Conference on Applied Superconductivity (EUCAS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on magnetic properties of π-junction-based artificial spin systems2021

    • Author(s)
      Masayuki Higashi, Yuto Takeshita, Hinata Fujisawa, Kento Kato, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      15th European Conference on Applied Superconductivity (EUCAS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pursuit of high-speed operation and low energy consumption in superconductor logic circuits2021

    • Author(s)
      Akira Fujimaki, Feng Li, Masamitsu Tanaka, Taro Yamashita
    • Organizer
      The 14th Superconducting SFQ VLSI Workshop (SSV 2021) / 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on pulse-driven, low energy consumption memory based on 0-π SQUIDs2021

    • Author(s)
      Yuto Takeshita, Hinata Fujisawa, Kento Kato, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      The 14th Superconducting SFQ VLSI Workshop (SSV 2021) / 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 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2021

    • Author(s)
      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
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] SFQアニーラに向けた単一のスピン素子の特性評価2021

    • Author(s)
      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
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 半磁束量子-単一磁束量子変換回路の実証2021

    • Author(s)
      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
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 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2021

    • Author(s)
      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
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 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2021

    • Author(s)
      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
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 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2021

    • Author(s)
      長岡一起,加島亮太, 中埜智貴, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      2021年電子情報通信学会総合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 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2021

    • Author(s)
      加島亮太, 長岡一起, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      2021年電子情報通信学会総合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 低消費電力単一磁束量子回路の動作周波数の調査2021

    • Author(s)
      国吉真波, 村瀬健, 長岡一起, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      超伝導エレクトロニクス研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Logic Functions Realized Using Clockless Gates for Rapid Single-Flux-Quantum Circuits2021

    • Author(s)
      Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      The 23rd Workshop on Synthesis And System Integration of Mixed Information Technologies
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SFQ回路を用いた超伝導コンピュータの開発2021

    • Author(s)
      高木直史
    • Organizer
      2021年電子情報通信学会総合大会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 単一磁束量子回路における微細受動伝送線路の特性評価2021

    • Author(s)
      池戸駿介、山梨裕希、吉川信行
    • Organizer
      2021年電子情報通信学会総合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Phase-shift flux quantum bit with NbN/CuNi/NbN π-junction2020

    • Author(s)
      Yamashita Taro, Zuo Kim, Urade Yoshiro, Qiu Wei, Terai Hirotaka, and Fujimaki Akira
    • Organizer
      2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)
    • Related Report
      2020 Annual Research Report
  • [Presentation] Extremely energy-efficient processing using superconductor circuits near physical limits2020

    • Author(s)
      Masamitsu Tanaka, Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)
    • Related Report
      2020 Annual Research Report
  • [Presentation] Demonstration of flux-bias-free flux qubit with a ferromagnetic π junction2020

    • Author(s)
      Taro Yamashita, Kum Zuo, Yoshiro Urada, Wei Qiu, Hirotaka Terai, Akira Fujimaki, and Yasunobu Nakamura
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 0-GHz datapath for parallel SFQ microprocessors based on gate-level-pipeline architecture2020

    • Author(s)
      Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of π-junction-based SQUIDs with half-flux-quantum modulation periods for energy-efficient circuits2020

    • Author(s)
      Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of timing parameters in single flux quantum circuits using low critical current junctions and low bias voltages2020

    • Author(s)
      Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-density routing with wire length matching for single-flux-quantum circuits using thin passive transmission lines2020

    • Author(s)
      Kei Kitamura Masamitsu Tanaka, Takahiro Kawaguchi, Ikki Nagaoka, Kazuyoshi Takagi, Akira Fujimaki, and Naofumi Takagi
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Analysis on half flux quantum circuits formed with π and conventional Josephson junctions2020

    • Author(s)
      Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of a 52-GHz, energy-efficient, bit-parallel multiplier using low-voltage rapid single-flux-quantum logic2020

    • Author(s)
      Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Takatsugi Ono, Koji Inoue, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Proposal of SFQ annealer using π-junction-based SQUIDs operating at 4 K, Masayuki Higashi2020

    • Author(s)
      Daiki Hasegawa, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on pulse-driven, high-speed memory based on 0-π SQUIDs with passive transmission lines2020

    • Author(s)
      Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
    • Organizer
      2020 Applied Superconductivity Conference (ASC 2020)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      国吉真波, 長岡一起, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      2020年電子情報通信学会ソサイエティ大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      加島亮太, 長岡一起, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      2020年電子情報通信学会ソサイエティ大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Static Timing Analysis of an RSFQ Circuit Considering Timing Jitter2020

    • Author(s)
      Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      The 33rd International Symposium on Superconductivity
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Efficient Timing Fault Simulation of Rapid Single-Flux-Quantum Logic Circuits Considering the Pipelined Behavior2020

    • Author(s)
      Shogo Nakamura, Kazuyoshi Takagi, Nobutaka Kito, and Naofumi Takagi
    • Organizer
      The 33rd International Symposium on Superconductivity
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation and measurement of narrow passive transmission lines for single flux quantum circuits2020

    • Author(s)
      Shunsuke Ikedo, Yuki Yamanashi, and Nobuyuki Yoshikawa
    • Organizer
      The 33rd International Symposium on Superconductivity (ISS2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 単一磁束量子回路における受動伝送線路微細化の検討2020

    • Author(s)
      池戸 駿介、山梨 裕希、吉川 信行
    • Organizer
      2020年度春季低温工学・超電導学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 高臨界電流密度ジョセフソン集積回路プロセスにおける受動伝送線路特性の調査2020

    • Author(s)
      池戸駿介、山梨裕希、吉川信行
    • Organizer
      2020年電子情報通信学会ソサイエティ大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 単一磁束量子回路における受動伝送線路微細化の検討と評価2020

    • Author(s)
      池戸駿介、山梨裕希、吉川信行
    • Organizer
      電気学会金属・セラミックス超電導機器合同研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 窒化物超伝導量子ビット2020

    • Author(s)
      寺井弘高, 金鮮美, 布施智子, 丘偉, 山下太郎, 吉原文樹, 仙場浩一
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 強磁性ジョセフソン接合の作製技術と量子デバイス応用2020

    • Author(s)
      山下太郎
    • Organizer
      電子情報通信学会2020年総合大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 超伝導集積回路プロセス2020

    • Author(s)
      日高睦夫, 永沢秀一 ,牧瀬圭正
    • Organizer
      電子情報通信学会2020年総合大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Development of 50-GHz, high-throughput rapid single-flux-quantum circuits toward ultra-fast, energy-efficient computing2020

    • Author(s)
      Masamitsu Tanaka, Ikki Nagaoka, Kyosuke Sano, Taro Yamashita, Koki Ishida, Takatsugu Ono, Koji Inoue, Akira Fujimaki
    • Organizer
      10th Asian Conference on Applied Superconductivity and Cryogenics (ACASC), 2nd International Cryogenic Materials Conference in Asia (Asian-ICMC), and CSSJ Joint Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Challenges to thermal limit, quantum limit, and high throughput based on SFQ circuits2020

    • Author(s)
      Akira Fujimaki, Masamitsu Tanaka, Nobuyuki Yoshikawa
    • Organizer
      2020 International Symposium on Superconductor Electronics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of gate-level-pipelined SFQ circuits toward ultra-high-speed cryogenic computing2020

    • Author(s)
      Masamitsu Tanaka, Ikki Nagaoka, Koki Ishida, Kyosuke Sano, Taro Yamashita, Takatsugu Ono, Koji Inoue, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Phase-shift flux qubit with a ferromagnetic π junction2020

    • Author(s)
      Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki and Yasunobu Nakamura
    • Organizer
      merican Physical Society (APS) March meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] NbN-based superconducting qubit on Si substrate2020

    • Author(s)
      Sunmi Kim, Tomoko Fuse, Fumiki Yoshihara, Wei Qiu, Taro Yamashita, Ziqiao Ao, Kouichi Semba, Hirotaka Terai
    • Organizer
      merican Physical Society (APS) March meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-throughput gate-level-pipelined SFQ multipliers2020

    • Author(s)
      Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Koji Inoue, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design of datapath for 8 bit parallel SFQ microprocessors with gate level pipelines2020

    • Author(s)
      Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Simulation and comparison of the energy efficiency of half flux quantum circuits2020

    • Author(s)
      Feng Li, Yuto Takeshita, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of SQUIDs with a period of half flux quantum in modulation patterns for half flux quantum circuits2020

    • Author(s)
      Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of SQUIDs with a period of half flux quantum in modulation patterns for half flux quantum circuits2020

    • Author(s)
      Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development and evaluation of superconducting n anowire single photon detectors with dielectric multilayers2020

    • Author(s)
      Fumihiro China, Shigehito Miki, Masahiro Yabuno, Taro Yamashita, Hirotaka Terai
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of timing design by using low-power SFQ shift registers2020

    • Author(s)
      Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Routing Method with Wire Length Matching for RSFQ Logic Circuits Using Thin PTLs2020

    • Author(s)
      Kei Kitamura, Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Comparison of Clocking Schemes for SFQ Circuits2020

    • Author(s)
      Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Introduction of Planarized High-speed Standard Process (PHSTP) to CRAVITY Digital Process2020

    • Author(s)
      Mutsuo Hidaka, Shuichi Nagasawa, and Kazumasa Makise
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and Simulation of Single-Flux-Quantum Multiply-Accumulator2020

    • Author(s)
      Z. Li, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of an SFQ 8-symbol Complex Event Detector Corresponding to Regular Expressions2020

    • Author(s)
      Kazuma Akizuki, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design of SFQ Convolutional Computation Processor for Convolutional Neural Network2020

    • Author(s)
      F. Ke, A. Ren, Y. Wang, O. Chen, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      13th Superconducting SFQ VLSI Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 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2020

    • Author(s)
      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
    • Organizer
      電子情報通信学会2020年総合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      加島亮太, 長岡一起, 田中雅光, 佐野京佑, 山下太郎, 藤巻朗
    • Organizer
      電子情報通信学会2020年総合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      長岡一起, 田中雅光, 佐野京佑, 山下太郎, 井上弘士, 藤巻朗
    • Organizer
      電子情報通信学会2020年総合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 位相シフタとしてπ接合rf-SQUIDを用いた量子化磁束パラメトロン2020

    • Author(s)
      赤池宏之, 藤巻朗
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 強磁性π接合を用いた磁束バイアスフリーな磁束型量子ビット2020

    • Author(s)
      山下太郎, Zuo Kun, 浦出芳郎, Qiu Wei, 寺井弘高, 藤巻朗, 中村泰信
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      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
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      中村颯, 加藤悠輝, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 接合付加による半磁束量子回路の低消費エネルギー化2020

    • Author(s)
      藤巻朗, Li Feng, 竹下雄登, 長谷川大輝, 佐野京佑, 田中雅光, 山下太郎
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 半磁束量子回路の実証に向けた動作解析2020

    • Author(s)
      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
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2020

    • Author(s)
      東正志, 長谷川大輝, 竹下雄登, Li Feng, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ポイントコンタクトによる非従来型超伝導の検証2020

    • Author(s)
      伊藤誠一朗, 矢野力三, 山下太郎, 柏谷聡
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Developments of Nb-based Fabrication Process and Flip-chip Technology toward Superconductor Quantum Digital Systems2019

    • Author(s)
      Mutsuo Hidaka, Shuichi Nagasawa, and Kazumasa Makise
    • Organizer
      1st Workhop on Quantum and Classical Cryogenic Devices, Circuits, and Systems
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Numerical and experimental analysis on π-shifted SQUIDs for logic circuits and memories2019

    • Author(s)
      Akira Fujimaki, Yuto Takeshita, Daiki Hasegawa, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita
    • Organizer
      10th East Asia Symposium on Superconductor Electronics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Design and demonstration of superconducting single flux quantum circuits operating around 50 GHz2019

    • Author(s)
      Akira Fujimaki
    • Organizer
      22nd Workshop on Synthesis And System Integration of Mixed Information Technologies
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Impulse-driven high-speed matrix memory based on π-shifted Josephson junctions2019

    • Author(s)
      Akira Fujimaki, Yuto Takeshita, Tomohiro Kamiya, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Asynchronous Superconducting Digital Circuits2019

    • Author(s)
      Nobuyuki Yoshikawa
    • Organizer
      25th IEEE International Symposium on Asynchronous Circuits and Systems
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Energy consumption of half flux quantum circuits using π-shifted Josephson junctions2019

    • Author(s)
      Feng Li, Yuto Takeshita, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      32nd International Symposium on Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Global Routing Method with Wire Length Budgeting for PTL Routing of SFQ Logic Circuits2019

    • Author(s)
      Kei Kitamura, Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      32nd International Symposium on Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Scan Design with Clockless Logic Gates for SFQ Circuits2019

    • Author(s)
      Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      32nd International Symposium on Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and High-speed Test of an SFQ-based Single-chip FFT processor2019

    • Author(s)
      F. Ke, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      32nd International Symposium on Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Single-Flux-Quantum Parallel Multiplier Using Accumulator Unit2019

    • Author(s)
      Z. Li, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      32nd International Symposium on Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] NbN-based Superconducting Qubit on Si Substrate2019

    • Author(s)
      Sunmi Kim, Tomoko Fuse, Fumiki Yoshihara, Wei Qiu, Taro Yamashita, Ziqiao Ao, Kouichi Semba, Hirotaka Terai
    • Organizer
      ISNTT2019 Symposium
    • Related Report
      2019 Annual Research Report
  • [Presentation] π-phase-shift Flux Qubit with a Ferromagnetic Josephson Junction2019

    • Author(s)
      Taro Yamashita, K. Zuo, Y. Urade, Q. Wei, Hirotaka Terai, Akira Fujimaki, Yasunobu Nakamura
    • Organizer
      ISNTT2019 Symposium
    • Related Report
      2019 Annual Research Report
  • [Presentation] Development of NbN-based superconducting quantum circuit: 0-qubit and π-qubit2019

    • Author(s)
      Sunmi Kim, Taro Yamashita, Tomoko Fuse, Fumiki Yoshihara, Wei Qiu, Ziqiao Ao, Kouichi Semba, Hirotaka Terai
    • Organizer
      1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] π-shifted SQUID based circuits and applications for classical computing and beyond2019

    • Author(s)
      Masamitsu Tanaka, Yuto Takeshita, Daiki Hasegawa, Feng Li, Kyosuke Sano, Taro Yamashita, Akira Fujimaki
    • Organizer
      1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of nTrons triggered by SFQ signals in monolithic ICs of Josephson junctions and nTrons2019

    • Author(s)
      Kyosuke Sano, Naoki Kondo, Masamitsu Tanaka, Taro Yamashita, Masumi Inoue, Akira Fujimaki
    • Organizer
      1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Test Pattern Generation for Timing Faults in Rapid Single-Flux-Quantum Circuits2019

    • Author(s)
      Kazuyoshi Takagi, Mikihiro Ono, Nobutaka Kito, and Naofumi Takagi
    • Organizer
      The 22nd Workshop on Synthesis And System Integration of Mixed Information technologies
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Monolithic ICs of Josephson junctions and nTrons for large-capacity memories2019

    • Author(s)
      Kyosuke Sano, Naoki Kondo, Masamitsu Tanaka, Taro Yamashita, Masumi Inoue, Akira Fujimaki
    • Organizer
      14th European Conference on Applied Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Proposal of SQUIDs with a period of half flux quantum in modulation patterns2019

    • Author(s)
      Yuto Takeshita, Daiki Hasegawa, Tomohiro Kamiya, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      14th European Conference on Applied Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Superconducting flux qubit with NbN-based ferromagnetic π junction2019

    • Author(s)
      Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki and Yasunobu Nakamura
    • Organizer
      14th European Conference on Applied Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-Speed Operation of a 13-bit 50-sample/period SFQ-based Sine Code Generator2019

    • Author(s)
      F. Ke, Yuki Yamanashi, T. Ortlepp, Nobuyuki Yoshikawa
    • Organizer
      14th European Conference on Applied Superconductivity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical analysis of low-power logic family based on half flux quantum using π-shifted Josephson junctions2019

    • Author(s)
      Masamitsu Tanaka, Tomohiro Kamiya, Yuto Takeshita, Yuta Yoshinomoto, Daiki Hasegawa, Kyosuke Sano, Taro Yamashita, Akira Fujimaki
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of an Energy-Efficient, Gate-Level-Pipelined 100 TOPS/W Arithmetic Logic Unit Based on Low-Voltage Rapid Single-Flux-Quantum Logic2019

    • Author(s)
      Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Koji Inoue, Akira Fujimaki
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetic Josephson junctions on Nb four-layer structure for half flux quantum circuits2019

    • Author(s)
      Daiki Hasegawa, Yuto Takeshita, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Placement and Routing Methods Based on Mixed Wiring of JTLs and PTLs for RSFQ Circuits2019

    • Author(s)
      Takashi Dejima, *Kazuyoshi Takagi, and Naofumi Takagi
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurement of an SFQ complex event detector for complex event processing2019

    • Author(s)
      Kazuma Akizuki, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Demonstration of a single-flux-quantum microprocessor operating with a Josephson-CMOS hybrid memory2019

    • Author(s)
      Yuki Hironaka, T. Ortlepp, Yuki Yamanashi, Nobuyuki Yoshikawa
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurement of Single-Flux-Quantum Floating-Point Divider Based on Goldschmidt's Algorithm2019

    • Author(s)
      Yuki Yamanashi, A. Sanada, Nobuyuki Yoshikawa
    • Organizer
      17th International Superconductive Electronics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Phase-shift flux qubit with ferromagnetic π junction2019

    • Author(s)
      Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki and Yasunobu Nakamura
    • Organizer
      20th Anniversary of Superconducting Qubits
    • Related Report
      2019 Annual Research Report
  • [Presentation] NbN-based superconducting quantum circuit on Si substrate2019

    • Author(s)
      Sunmi Kim, Taro Yamashita, Tomoko Fuse, Fumiki Yoshihara, Wei Qiu, Ziqiao Ao, Hirotaka Terai and Kouichi Semba
    • Organizer
      20th Anniversary of Superconducting Qubits
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2019

    • Author(s)
      長岡一起, 田中雅光, 佐野京佑, 山下太郎, 井上弘士, 藤巻朗
    • Organizer
      評価」, 電子情報通信学会2019年ソサイエティ大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Si基板上のNbNベース超伝導量子ビットのコヒーレンス特性評価2019

    • Author(s)
      金鮮美,山下太郎,布施智子,吉原文樹,丘偉,敖子,仙場浩一,寺井弘高
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 非従来型超伝導の検証を目指したポイントコンタクト装置の開発2019

    • Author(s)
      伊藤誠一朗, 矢野力三, 山下太郎, 柏谷聡
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 単一磁束量子回路と超伝導ナノデバイスの集積化プロセスの検討2019

    • Author(s)
      近藤真生, 佐野京佑, 田中雅光, 山下太郎, 井上真澄, 藤巻朗
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Nb4層超伝導集積回路上での磁性ジョセフソン接合の作製2019

    • Author(s)
      長谷川大輝, 竹下雄登, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 磁場変調パターンが半磁束量子周期となるSQUIDの作製2019

    • Author(s)
      竹下雄登, 長谷川大輝, 神谷智大, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] NbNフルエピタキシャル接合を用いた超伝導量子ビットの作製・評価2019

    • Author(s)
      寺井弘高, 金鮮美, 布施智子, 丘偉, 山下太郎, 吉原文樹, 仙場浩一
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 超伝導高速単一磁束量子(RSFQ)回路のタイミング調節ための配線長予約を用いた概略配線手法2019

    • Author(s)
      北村圭, 高木直史, 高木一義
    • Organizer
      情報処理学会DAシンポジウム2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 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2019

    • Author(s)
      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
    • Organizer
      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
    • Related Report
      2019 Annual Research Report
  • [Presentation] 100TOPS/W超伝導単一磁束量子演算器2019

    • Author(s)
      長岡一起, 田中雅光, 佐野京佑, 山下太郎, 井上弘士, 藤巻朗
    • Organizer
      LSIとシステムのワークショップ2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Design of a One-Instruction-Set SFQ Microprocessor for High-Speed Demonstration of SFQ/CMOS Hybrid System2019

    • Author(s)
      Y. Hironaka, Y. Yamanashi, N. Yoshikawa
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 56-GHz demonstration of a 13-bit 50-sample/period SFQ-based sine code generator using 10 kA/cm2 Nb process2019

    • Author(s)
      F. Ke, Y. Yamanashi, T. Ortlepp, N. Yoshikawa
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Compact High Selectivity In-Line Topology Filter Based on LTS Technology2019

    • Author(s)
      Y. He, N. Takeuchi, N. Yoshikawa
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Road to Superconductor-Based World-Fastest Computer2019

    • Author(s)
      A. Fujimaki, T. Kamiya, Y. Takeshita, H. Kato, I. Nagaoka, K. Sano, M. Tanaka, T. Yamashita
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 0-p SQUID Based Matrix Memory Driven by SFQ Pulses2019

    • Author(s)
      Y. Takeshita, T. Kamiya, K. Sano, M. Tanaka, A. Fujimaki, T. Yamashita
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Hierarchical Placement Method with Cell Clustering for Rapid-Single-Flux-Quantum Circuits2019

    • Author(s)
      T. Dejima, K.Takagi, N. Takagi
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Global Routing Method with Wire Length Budgeting for SFQ Logic Circuits2019

    • Author(s)
      K. Kitamura, K.Takagi, N. Takagi
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Encoder/Decoder for the Compound Signal of Data and Clock2019

    • Author(s)
      T. Kawaguchi, K.Takagi, N. Takagi
    • Organizer
      12th Superconducting SFQ VLSI Workshop (SSV 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 1-Gb Josephson-CMOSハイブリッドメモリに向けた超伝導ナノ構造ラインドライバの検討2019

    • Author(s)
      佐野京佑, 丸山晃平, 田中雅光, 山下太郎, 井上真澄, 藤巻朗
    • Organizer
      第65回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] SFQパルス駆動マトリクスメモリの実現に向けた動作解析2019

    • Author(s)
      竹下雄登, 神谷智大, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      第65回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Power-Controllable Superconducting AC/DC Converters for DC-Driven Energy- Efficient Single-Flux-Quantum Circuits2018

    • Author(s)
      A. Fujimaki, S. Taniguchi, H. Kato, H. Iwashita, T. Yamashita, M. Tanaka
    • Organizer
      Applied Superconductivity Conference (ASC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 30-GHz Operation of Datapath for Bit-Parallel, Gate-Level-Pipelined Rapid Single- Flux-Quantum Microprocessors2018

    • Author(s)
      M. Tanaka, Y. Hatanaka, Y. Matsui, I. Nagaoka, K. Ishida, K. Sano, T. Yamashita, O. Takatsugu, K. Inoue, A. Fujimaki
    • Organizer
      Applied Superconductivity Conference (ASC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] DC-Offset-Free Quantum Flux Parametron using Ferromagnet Phase Shift Elements2018

    • Author(s)
      M. Tanaka, H. Ito, S. Taniguchi, H. Iwashita, K. Sano, T. Yamashita, A. Fujimaki
    • Organizer
      Applied Superconductivity Conference (ASC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Short turn-on-delay superconducting nanostructure transistors2018

    • Author(s)
      K. Sano, M. Suzuki, K. Maruyama, N. Kondo, M. Tanaka, T. Yamashita, M. Inoue, A. Fujimaki
    • Organizer
      Applied Superconductivity Conference (ASC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Low-power half single flux quantum circuits based on π-shifted Josephson junctions2018

    • Author(s)
      T. Kamiya, Y. Takeshita, K. Sano, M. Tanaka, T. Yamashita, A. Fujimaki
    • Organizer
      Applied Superconductivity Conference (ASC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and demonstration of an SFQ-based full-component singlechip FFT processor2018

    • Author(s)
      F. Ke, Y. Yamanashi, N. Yoshikawa
    • Organizer
      Applied Superconductivity Conference (ASC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and evaluation of a one-instruction-set single-flux-quantum microprocessor for the demonstration of Josephson-CMOS hybrid system2018

    • Author(s)
      Y. Hironaka, Y. Yamanashi, N. Yoshikawa
    • Organizer
      The 31st International Symposium on Superconductivity (ISS2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and demonstration of an 8-bit 18-sample/cycle sine code generator using single-flux-quantum circuits2018

    • Author(s)
      F. Ke, Y. Yamanashi, T. Ortlepp, N. Yoshikawa
    • Organizer
      The 31st International Symposium on Superconductivity (ISS2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical Analysis of Low-Power Half Single Flux Quantum Circuits Based on 0-π SQUIDs2018

    • Author(s)
      M. Tanaka, Y. Yoshinomoto, T. Kamiya, K. Sano, T. Yamashita, A. Fujimaki
    • Organizer
      The 31st International Symposium on Superconductivity (ISS2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Progress in DC-powered single-flux-quantum integrated circuits2018

    • Author(s)
      A. Fujimaki, K. Sano, T. Yamashita, M. Tanaka
    • Organizer
      4th International Workshop on Superconducting Sensors and Detectors (IWSSD 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] New Circuits for Highly Sensitive Sensers and for Energy-Efficient Logics2018

    • Author(s)
      A. Fujimaki, T. Kamiya, K. Sano, T. Yamachita, M. Tanaka
    • Organizer
      Workshop on the Future of Silicon Detector Technologies (FuTuRe II)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 超伝導単一磁束量子(SFQ)回路設計のためのタイミング制約を考慮した自動配置アルゴリズム2018

    • Author(s)
      出島貴史、高木一義、高木直史
    • Organizer
      情報処理学会 DAシンポジウム2018
    • Related Report
      2018 Annual Research Report
  • [Presentation] 大規模SFQ論理回路のパルス到着タイミングを最適化する配置手法2018

    • Author(s)
      北村圭、高木一義、高木直史
    • Organizer
      電子情報通信学会エレクトロニクスソサイエティ大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 単一磁束量子回路とナノクライオトロンのモノリシック化の検討2018

    • Author(s)
      丸山晃平, 佐野京佑, 田中雅光, 山下太郎, 井上真澄, 藤巻朗
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 強磁性πジョセフソン接合を用いたトグルフリップフロップの作製2018

    • Author(s)
      神谷智大, 竹下雄登, 佐野京佑, 田中雅光, 山下太郎, 藤巻朗
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] SFQパルス駆動マトリクスメモリの開発2018

    • Author(s)
      竹下雄登, 神谷智大, 田中雅光, 佐野京佑, 藤巻朗
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] 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

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] 13th Superconducting SFQ VLSI Workshop2020

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] 1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems2019

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] 12th Superconducting SFQ VLSI Workshop (SSV 2019)2019

    • Related Report
      2018 Annual Research Report

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Published: 2018-04-25   Modified: 2022-12-28  

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