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

• Project/Area Number: 18H05211
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Nagoya 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 東北大学, 工学研究科, 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: Completed (Fiscal Year 2022)
• Budget Amount: ¥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: π接合 / 単一磁束量子回路 / 半磁束量子回路 / 磁性ジョセフソン接合 / パルス論理 / 半磁束量子 / 単一磁束量子 / 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、最終年度であったが、2021年10月より産業技術総合研究所（産総研）のクリーンルームの改修ならびに超伝導集積回路作製に関わる22台の製造機器の2/3の更新という想定していなかった事態に遭遇した。暫定的な復旧にも1年を要したことから、研究期間延長を承認いただき、実質的に実験を伴う研究については、2023年度まで実施した。しかしながら、更新した装置の微調整は、2023年度末まで続いたほか、産総研で試作を担当するテクニシャンの働き方改革の影響もあり、大きな制約下での研究実施となった。
大規模単一磁束量子（SFQ）回路については、測定評価を2022年度に行った。ゲートレベルパイプライン処理8ビットマイクロプロセッサの57GHz動作等、設計技術とともにサブ100GHz大規模SFQ回路の基盤技術を構築した。
π接合を利用した半磁束量子(HFQ)回路については、回路パラメータの最適化ツールの開発を通して、動作の本質に迫った。HFQ回路の基本要素となる0-π SQUID（0接合とπ接合を含む超伝導量子干渉素子）に自発的に流れる周回電流が、バイアス電流と同様に機能し、結果として小さなバイアス電流でHFQ回路は動作する。また、π接合の挿入は回路構成によっては自発的な位相シフトを誘起し、動作余裕を低下させる。この解消に向け、初期位相を確定するために、現在は適宜π接合を用いた位相シフタを挿入している。なお、産総研の製造プロセスの停止を受け、名古屋大学においてπ接合だけで、小規模SFQ／HFQ回路を形成するプロセスを構築、トグルフリップフロップなどを実証している。
メモリに関しては、光速で伝搬するSFQパルスだけでセル選択が可能なπ接合ベースのマトリクスメモリの開発を進めた。1セル並びに1x8セルのメモリを実証した。
このほか、3次元実装技術の研究を進め、SFQパルスの伝搬を確認した。

Research Progress Status

令和4年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和4年度が最終年度であるため、記入しない。

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.

Research Products

• [Journal Article] A High-Throughput Multiply-Accumulate Unit With Long Feedback Loop Using Low-Voltage Rapid Single-Flux Quantum Circuits (2023)
  • Author(s): Nagaoka Ikki、Kashima Ryota、Ishida Koki、Tanaka Masamitsu、Yamashita Taro、Ono Takatsugu、Inoue Koji、Fujimaki Akira
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 3 Pages: 1-8
  • DOI: 10.1109/tasc.2023.3239329
  • Peer Reviewed
• [Journal Article] Direct observations of π-leaps of superconducting phase differences in π-junction-based SQUIDs (2023)
  • Author(s): Takeshita Yuto、Li Feng、Higashi Masayuki、Tanaka Masamitsu、Yamashita Taro、Fujimaki Akira
  • Journal Title: Superconductor Science and Technology Volume: 36 Issue: 4 Pages: 045004-045004
  • DOI: 10.1088/1361-6668/acb38d
  • Peer Reviewed
• [Journal Article] Superconductor digital circuits with π junctions alone (2023)
  • Author(s): Li Feng、Takeshita Yuto、Tanaka Masamitsu、Fujimaki Akira
  • Journal Title: Applied Physics Letters Volume: 122 Issue: 16 Pages: 162601-162601
  • DOI: 10.1063/5.0144604
  • Peer Reviewed
• [Journal Article] 50-GFLOPS Floating-Point Adder and Multiplier Using Gate-Level-Pipelined Single-Flux-Quantum Logic With Frequency-Increased Clock Distribution (2023)
  • Author(s): Nagaoka Ikki、Kashima Ryota、Tanaka Masamitsu、Kawakami Satoshi、Tanimoto Teruo、Yamashita Taro、Inoue Koji、Fujimaki Akira
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 4 Pages: 1-11
  • DOI: 10.1109/tasc.2023.3250614
  • Peer Reviewed / Open Access
• [Journal Article] Analysis of the Effect of 0-π SQUIDs for Enhancing Mutual Coupling (2023)
  • Author(s): Higashi Masayuki、Takeshita Yuto、Kato Kento、Fujisawa Hinata、Li Feng、Tanaka Masamitsu、Yamashita Taro、Fujimaki Akira
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2023.3249657
  • Peer Reviewed
• [Journal Article] Lowering Latency in a High-Speed Gate-Level-Pipelined Single Flux Quantum Datapath Using an Interleaved Register File (2023)
  • Author(s): Kashima Ryota、Nagaoka Ikki、Nakano Tomoki、Tanaka Masamitsu、Yamashita Taro、Fujimaki Akira
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-6
  • DOI: 10.1109/tasc.2023.3249131
  • Peer Reviewed
• [Journal Article] Optimization of Half-Flux-Quantum Circuits Composed of π-Shift and Conventional Josephson Junctions (2023)
  • Author(s): Tanemura Shoma、Takeshita Yuto、Li Feng、Nakayama Toranosuke、Tanaka Masamitsu、Fujimaki Akira
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2023.3258374
  • Peer Reviewed
• [Journal Article] Energy efficient half-flux-quantum circuit aiming at milli-kelvin stage operation (2023)
  • Author(s): Li Feng、Pham Duong、Takeshita Yuto、Higashi Masayuki、Yamashita Taro、Tanaka Masamitsu、Fujimaki Akira
  • Journal Title: Superconductor Science and Technology Volume: 36 Issue: 10 Pages: 105006-105006
  • DOI: 10.1088/1361-6668/acf0f2
  • Peer Reviewed
• [Journal Article] Wire Length-Matching Aware Placement Method for Rapid Single Flux Quantum Logic Circuits (2023)
  • Author(s): Kitamura Kento、Kawaguchi Takahiro、Takagi Naofumi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2023.3262216
  • Peer Reviewed
• [Journal Article] Technology Mapping With Clockless Gates for Logic Stage Reduction of RSFQ Logic Circuits (2023)
  • Author(s): Kito Nobutaka、Kawaguchi Takahiro、Takagi Kazuyoshi、Takagi Naofumi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2023.3245049
  • Peer Reviewed
• [Journal Article] Fabrication Process for Monolithic Integration of a Nitride Superconductor-Based Superconducting Qubit with a Single Flux Quantum Control Circuit (2023)
  • Author(s): Miyajima Shigeyuki、Yamashita Taro、Tanaka Masamitsu、Takeuchi Naoki、Inomata Kunihiro、Terai Hirotaka
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-4
  • DOI: 10.1109/tasc.2023.3241270
  • Peer Reviewed
• [Journal Article] Design and Component Demonstration of an SFQ Complex Event Detector Corresponding to Regular Expressions (2023)
  • Author(s): Suzuki Takuya、Akizuki Kazuma、Yamanashi Yuki、Yoshikawa Nobuyuki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 33 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2023.3241266
  • Peer Reviewed
• [Journal Article] 32-Bit ALU with Clockless Gates for RSFQ Bit-Parallel Processor (2022)
  • Author(s): Kawaguchi Takahiro、Takagi Naofumi
  • Journal Title: IEICE Transactions on Electronics Volume: E105.C Issue: 6 Pages: 245-250
  • DOI: 10.1587/transele.2021SEP0005
  • NAID: 130008124492
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2022-06-01
  • Peer Reviewed
• [Journal Article] Current Status and Issues of Superconductor Peripheral Circuits for Quantum Computers (2022)
  • Author(s): 田中雅光, 山梨裕希
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 142 Issue: 5 Pages: 175-182
  • DOI: 10.1541/ieejfms.142.175
  • ISSN: 0385-4205, 1347-5533
  • Year and Date: 2022-05-01
  • Peer Reviewed
• [Journal Article] Weak spin-flip scattering in Pd89Ni11 interlayer of NbN-based ferromagnetic Josephson junctions (2022)
  • Author(s): Pham Duong、Sugimoto Riku、Oba Kenjiro、Takeshita Yuto、Li Feng、Tanaka Masamitsu、Yamashita Taro、Fujimaki Akira
  • Journal Title: Scientific Reports Volume: 12 Issue: 1 Pages: 1-8
  • DOI: 10.1038/s41598-022-10967-6
  • Peer Reviewed / Open Access
• [Journal Article] Static Timing Analysis for Single-Flux-Quantum Circuits Composed of Various Gates (2022)
  • Author(s): Kawaguchi Takahiro、Takagi Kazuyoshi、Takagi Naofumi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 32 Issue: 5 Pages: 1-9
  • DOI: 10.1109/tasc.2022.3161052
  • Peer Reviewed
• [Journal Article] Logic-Depth-Aware Technology Mapping Method for RSFQ Logic Circuits With Special RSFQ Gates (2022)
  • Author(s): KITO, Nobutaka、TAKAGI, Kazuyoshi、TAKAGI, Naofumi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 32 Issue: 4 Pages: 1-5
  • DOI: 10.1109/tasc.2021.3129719
  • Peer Reviewed
• [Journal Article] Planarized Nb 4-Layer Fabrication Process for Superconducting Integrated Circuits and Its Fabricated Device Evaluation (2021)
  • 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 Transactions on Electronics Volume: E104.C Issue: 9 Pages: 435-445
  • DOI: 10.1587/transele.2020SUP0001
  • NAID: 130008082182
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2021-09-01
  • Peer Reviewed
• [Journal Article] Fabrication Process for Superconducting Digital Circuits (2021)
  • Author(s): Mutsuo Hidaka and Shuichi Nagasawa
  • Journal Title: IEICE Transactions on Electronics Volume: E104.C Issue: 9 Pages: 405-410
  • DOI: 10.1587/transele.2020SUI0002
  • NAID: 130008082178
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2021-09-01
  • Peer Reviewed
• [Journal Article] High-speed memory driven by SFQ pulses based on 0-π SQUID (2021)
  • 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 Issue: 5 Pages: 1100906-1100906
  • DOI: 10.1109/tasc.2021.3060351
  • Peer Reviewed
• [Journal Article] Demonstration of Interface Circuits Between Half- and Single- Flux- Quantum Circuits (2021)
  • 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 Issue: 5 Pages: 1-4
  • DOI: 10.1109/tasc.2021.3072846
  • Peer Reviewed
• [Journal Article] 64-GHz datapath demonstration for bit-parallel SFQ microprocessors based on a gate-level-pipeline structure (2021)
  • Author(s): Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 31-5 Issue: 5 Pages: 1301006-1301006
  • DOI: 10.1109/tasc.2021.3061353
  • Peer Reviewed
• [Journal Article] Demonstration of a 52-GHz Bit-Parallel Multiplier Using Low-Voltage Rapid Single-Flux-Quantum Logic (2021)
  • 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 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2021.3071996
  • Peer Reviewed
• [Journal Article] Investigation of Timing Parameters in Single-Flux-Quantum Circuits Using Low Critical-Current Junctions and Low Bias Voltages (2021)
  • 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 Issue: 5 Pages: 1101405-1101405
  • DOI: 10.1109/tasc.2021.3067827
  • Peer Reviewed
• [Journal Article] Synchronous SFQ Address Encoder for Superconductor Detector Arrays (2021)
  • Author(s): Bozbey Ali, Aydogan Eren, Usenmez Kubra, Razmkhah Sasan, Tanaka Masamitsu, Fujimaki Akira
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 31 Issue: 4 Pages: 1300106-1300106
  • DOI: 10.1109/tasc.2021.3065000
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Rapid Single-Flux-Quantum Logic Circuits Using Clockless Gates (2021)
  • Author(s): Kawaguchi Takahiro、Takagi Kazuyoshi、Takagi Naofumi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 31 Issue: 4 Pages: 1-7
  • DOI: 10.1109/tasc.2021.3068960
  • Peer Reviewed
• [Journal Article] A Timing Fault Model and an Efficient Timing Fault Simulation Method for Rapid Single-Flux-Quantum Logic Circuits (2021)
  • Author(s): NAKAMURA, Shogo、TAKAGI, Kazuyoshi、KITO, Nobutaka、TAKAGI, Naofumi
  • Journal Title: Journal of Physics: Conference Series Volume: 1975 Issue: 1 Pages: 012026-012026
  • DOI: 10.1088/1742-6596/1975/1/012026
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Low-power high-speed half-flux-quantum circuits driven by low bias voltages (2021)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Journal Title: Superconductor Science and Technology Volume: 34-2 Issue: 2 Pages: 025013-025013
  • DOI: 10.1088/1361-6668/abcaac
  • NAID: 120007145973
  • Peer Reviewed
• [Journal Article] Demonstration of a 47.8 GHz High-Speed FFT Processor Using Single-Flux-Quantum Technology (2021)
  • Author(s): Fei Ke, Olivia Chen, Yanzhi Wang and Nobuyuki Yoshikawa
  • Journal Title: IEEE Trans. Appl. Supercond Volume: 31-5 Issue: 5 Pages: 1-5
  • DOI: 10.1109/tasc.2021.3059984
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Two-Step Routing Method with Wire Length Budgeting for PTL Routing of SFQ Logic Circuits (2020)
  • Author(s): Kei Kitamura, Kazuyoshi Takagi, and Naofumi Takagi
  • Journal Title: Journal of Physics Volume: 1590 Issue: 1 Pages: 012043-012043
  • DOI: 10.1088/1742-6596/1590/1/012043
  • Peer Reviewed / Open Access
• [Journal Article] Conversion Method of Netlists Consisting of Conventional Logic Gates to RSFQ Logic Circuits Utilizing Special RSFQ Gates (2020)
  • Author(s): Kito Nobutaka、Takagi Kazuyoshi、Takagi Naofumi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 30 Issue: 7 Pages: 1-6
  • DOI: 10.1109/tasc.2020.3012474
  • Peer Reviewed
• [Journal Article] Layout Design Flow for RSFQ Circuits Based on Cell Clustering and Mixed Wiring of JTLs and PTLs (2020)
  • Author(s): Takashi Dejima, Kazuyoshi Takagi, and Naofumi Takagi
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 30-7 Issue: 7 Pages: 1302506-1302506
  • DOI: 10.1109/tasc.2020.3014928
  • Peer Reviewed
• [Journal Article] Fundamental study on the nanocryotron properties by the numerical calculation (2019)
  • Author(s): Masumi Inoue, Kazuki Izaki, Yuki Goto, Kyosuke Sano, Taro Yamashita, Masamitsu Tanaka, Akira Fujimaki
  • Journal Title: EEE Trans. Appl. Supercond. Volume: 29 Pages: 1-1
  • DOI: 10.1109/tasc.2019.2904585
  • Peer Reviewed
• [Journal Article] Fabrication of NbTiN Josephson junctions with thermally oxidized Hf tunnel barriers (2019)
  • Author(s): H. Akaike、K. Munemoto、Y. Sakakibara、A. Fujimaki
  • Journal Title: IEEE Trans. on Appl. Supercond. Volume: 29 Issue: 5 Pages: 1102605-1102605
  • DOI: 10.1109/tasc.2019.2906278
  • 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 Cryocooler (2019)
  • Author(s): Takeuchi Naoki、Yamashita Taro、Miyajima Shigeyuki、Miki Shigehito、Yoshikawa Nobuyuki、Terai Hirotaka
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 29 Issue: 5 Pages: 1-4
  • DOI: 10.1109/tasc.2019.2902771
  • Peer Reviewed
• [Journal Article] Boosting the secret key rate in a shared quantum and classical fibre communication system (2019)
  • 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 Issue: 1
  • DOI: 10.1038/s42005-019-0238-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Thermally Assisted Superconductor Transistors for Josephson-CMOS Hybrid Memories (2018)
  • Author(s): K. Sano, M. Suzuki, K. Maruyama, S. Taniguchi, M. Tanaka, A Fujimaki, M. Inoue, N. Yoshikawa
  • Journal Title: IEICE Transactions on Electronics Volume: E101.C Issue: 5 Pages: 370-377
  • DOI: 10.1587/transele.E101.C.370
  • NAID: 130006729728
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2018-05-01
  • Peer Reviewed
• [Journal Article] Energy/Space-Efficient Rapid Single-Flux-Quantum Circuits by Using <i>π</i>-Shifted Josephson Junctions (2018)
  • Author(s): T. Kamiya, M. Tanaka, K. Sano, A. Fujimaki
  • Journal Title: IEICE Transactions on Electronics Volume: E101.C Issue: 5 Pages: 385-390
  • DOI: 10.1587/transele.E101.C.385
  • NAID: 130006729704
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2018-05-01
  • 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
  • Peer Reviewed
• [Presentation] Demonstration of increased efficiency in signal transfer circuits caused by a negative inductance of a π-junction (2023)
  • Author(s): Fujimaki Akira, Higashi Masayuki, Hori Hiroki, Mori Hinako, Li Feng, Tanaka Masamitsu
  • Organizer: 36th International Symposium on Superconductivity (ISS 2023)
  • Int'l Joint Research
• [Presentation] Low-power operation of half-flux-quantum circuits (2023)
  • Author(s): Tanaka Masamitsu, Tanemura Shoma, Nakayama Toranosuke, Higashi Masayuki, Fujimaki Akira
  • Organizer: 36th International Symposium on Superconductivity (ISS 2023)
  • Int'l Joint Research
• [Presentation] Logic and memory circuits based on π-junction-based SQUIDs (2023)
  • Author(s): Fujimaki Akira, Li Feng, Takeshita Yuto, Tanemura Shoma, Nakayama Toranosuke, Tanaka Masamitsu
  • Organizer: 18th International Superconductive Electronics Conference (ISEC 2023)
  • Int'l Joint Research / Invited
• [Presentation] Energy efficient half-flux-quantum circuit aiming at milli-kelvin stage operation (2023)
  • Author(s): Li feng, Pham Duong, Takeshita Yuto, Tanemura Shoma, Higashi Masayuki, Yamashita Taro, Tanaka Masamitsu, Fujimaki Akira
  • Organizer: 18th International Superconductive Electronics Conference (ISEC 2023)
  • Int'l Joint Research
• [Presentation] Impulse-driven memory cell with a directly coupled word line for reduction in footprint (2023)
  • Author(s): Sato Taichi, Higashi Masayuki, Li Feng, Tanaka Masamitsu, Fujimaki Akira
  • Organizer: Joint Workshop of 5th QCCC, 16th Superconducting SFQ VLSI Workshop, and 2nd IWSQMD
  • Int'l Joint Research
• [Presentation] Demonstration of essential elements for realizing low-power half-flux-quantum circuits (2023)
  • Author(s): Nakayama Toranosuke, Tanemura Shoma, Higashi Masayuki, Li Feng, Tanaka Masamitsu, Fujimaki Akira
  • Organizer: Joint Workshop of 5th QCCC, 16th Superconducting SFQ VLSI Workshop, and 2nd IWSQMD
  • Int'l Joint Research
• [Presentation] SFQ interface circuit for high-speed clock domain crossing (2023)
  • Author(s): Hiwaki Kosuke, Tanaka Masamitsu, Li Feng, Fujimaki Akira
  • Organizer: Joint Workshop of 5th QCCC, 16th Superconducting SFQ VLSI Workshop, and 2nd IWSQMD
  • Int'l Joint Research
• [Presentation] Demonstration of a superconductor 8-bit microprocessor based on high-throughput single-flux-quantum logic circuits (2023)
  • Author(s): Tanaka Masamitsu, Nagaoka Ikki, Kawakami Satoshi, Tanimoto Teruo, Inoue Koji, Fujimaki Akira
  • Organizer: 11th East Asia Symposium on Superconductor Electronics (EASSE 2023)
  • Int'l Joint Research / Invited
• [Presentation] Scalable and flux-bias-free superconducting flux quantum bits (2023)
  • Author(s): Yamashita Taro
  • Organizer: MRM2023/IUMRS-ICA2023
  • Int'l Joint Research / Invited
• [Presentation] Novel superconducting flux quantum bits toward large-scale quantum circuits (2023)
  • Author(s): Yamashita Taro
  • Organizer: 15th International Workshop on High Temperature Superconductors in High Frequency Fields
  • Int'l Joint Research / Invited
• [Presentation] Niobium nitride based ferromagnetic Josephson junctions toward quantum applications (2023)
  • Author(s): Yamashita Taro
  • Organizer: 11th East Asia Symposium on Superconductor Electronics (EASSE 2023)
  • Int'l Joint Research / Invited
• [Presentation] One of the Key Issues in Fabrication Process toward Large-scale Superconducting Digital Circuits (2023)
  • Author(s): Hidaka Mutsuo
  • Organizer: 11th East Asia Symposium on Superconductor Electronics (EASSE 2023)
  • Int'l Joint Research / Invited
• [Presentation] 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 (2023)
  • Author(s): 上田伴春、中山彪之助、宮嶋茂之、寺井高弘、Pham Duong、田中雅光、山下太郎、藤巻朗
  • Organizer: 2023年電子情報通信学会総合大会
• [Presentation] 半磁束量子回路のパラメータ設計指針 (2023)
  • Author(s): 種村匠馬、中山彪之助、竹下雄登、李峰、田中雅光、藤巻朗
  • Organizer: 2023年電子情報通信学会総合大会
• [Presentation] 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 (2023)
  • Author(s): 袁磊、竹下雄登、東正志、中山彪之助、李峰、田中雅光、藤巻朗
  • Organizer: 第70回応用物理学会春季学術講演会
• [Presentation] 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 (2023)
  • Author(s): 東正志、竹下雄登、李峰、田中雅光、藤巻朗
  • Organizer: 第70回応用物理学会春季学術講演会
• [Presentation] 0-0-π SQUIDの非対称性が半磁束量子回路に及ぼす影響 (2023)
  • Author(s): 中山彪之助、堀裕貴、竹下雄登、李峰、田中雅光、藤巻朗
  • Organizer: 第70回応用物理学会春季学術講演会
• [Presentation] π-SQUIDに基づくインパルス駆動メモリセルの動作実証 (2023)
  • Author(s): 竹下雄登、藤澤日向、東正志、李峰、田中雅光、藤巻朗
  • Organizer: 第70回応用物理学会春季学術講演会
• [Presentation] インパルス駆動型メモリの拡張性に関する検討 (2023)
  • Author(s): 佐藤太一、藤澤日向、竹下雄登、李峰、田中雅光、藤巻朗
  • Organizer: 第70回応用物理学会春季学術講演会
• [Presentation] Superconducting diode using π-JJ-based arbitrary phase shifter (2023)
  • Author(s): Li Feng, Sato Taichi, Fujisawa Hinata, Takeshita Yuto, Tanaka Masamitsu, Fujimaki Akira
  • Organizer: 第70回応用物理学会春季学術講演会
• [Presentation] Half flux quantum circuit based on π-junctions (2022)
  • Author(s): Fujimaki Akira, Li Feng, Takeshita Yuto, Higashi Masayuki, Tanaka Masamitsu
  • Organizer: 35th International Symposium on Superconductivity (ISS 2022)
  • Int'l Joint Research / Invited
• [Presentation] Design methods of an RSFQ circuit composed of clocked gates and clockless gates (2022)
  • Author(s): Takagi Naofumi
  • Organizer: 2022 JSPS 146th Committee International Symposium on Superconductor Electronics, 15th SSV, 4th QCCC
  • Int'l Joint Research / Invited
• [Presentation] Fabrication Process for Superconductor Digital Circuits in AIST (2022)
  • Author(s): Hidaka Mutsuo
  • Organizer: 2022 JSPS 146th Committee International Symposium on Superconductor Electronics, 15th SSV, 4th QCCC
  • Int'l Joint Research / Invited
• [Presentation] 量子コンピュータに向けた超伝導ディジタル周辺回路 (2022)
  • Author(s): 田中雅光
  • Organizer: 2022年電子情報通信学会ソサイエティ大会
  • Invited
• [Presentation] 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 (2022)
  • Author(s): 種村匠馬、竹下雄登、李峰、田中雅光、藤巻朗
  • Organizer: 2022年電子情報通信学会ソサイエティ大会
• [Presentation] 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 (2022)
  • Author(s): 上田伴春、中山彪之助、田中雅光、山下太郎、藤巻朗
  • Organizer: 2022年電子情報通信学会ソサイエティ大会
• [Presentation] 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 (2022)
  • Author(s): 大場絢次郎、Pham Duong、田中雅光、山下太郎、藤巻朗
  • Organizer: 第83回応用物理学会秋季学術講演会
• [Presentation] SFIS磁性π接合に基づくアンシャントSFQ回路の特性評価 (2022)
  • Author(s): 李峰、袁磊、竹下雄登、東正志、田中雅光、藤巻朗
  • Organizer: 第83回応用物理学会秋季学術講演会
• [Presentation] π-π-π SQUIDs: The Switching Element of HFQ Circuits Operating at mK (2022)
  • 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
  • Invited
• [Presentation] Half-flux-quantum circuits using π-shifted ferromagnetic junctions (2021)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 34th International Symposium on Superconductivity (ISS2021)
  • Int'l Joint Research / Invited
• [Presentation] Implementation of a High-Throughput Bit-Parallel Microprocessor Using Single-Flux-Quantum Logic (2021)
  • Author(s): Ikki Nagaoka, Ryota Kashima, Tomoki Nakano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 15th European Conference on Applied Superconductivity (EUCAS 2021)
  • Int'l Joint Research / Invited
• [Presentation] Demonstration of half-flux-quantum T-flip flops made up with only π junctions (2021)
  • Author(s): Feng Li, Yuto Takeshita, Kento Kato, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 15th European Conference on Applied Superconductivity (EUCAS 2021)
  • Int'l Joint Research
• [Presentation] Demonstration of π-phase shift in NbN-based Josephson junctions with Pd89 Ni11 ferromagnetic interlayers (2021)
  • 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)
  • Int'l Joint Research
• [Presentation] Demonstration of impulse-driven, high-speed memories based on 0-π SQUIDs (2021)
  • 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)
  • Int'l Joint Research
• [Presentation] Study on magnetic properties of π-junction-based artificial spin systems (2021)
  • 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)
  • Int'l Joint Research
• [Presentation] Pursuit of high-speed operation and low energy consumption in superconductor logic circuits (2021)
  • 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)
  • Int'l Joint Research
• [Presentation] Study on pulse-driven, low energy consumption memory based on 0-π SQUIDs (2021)
  • 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)
  • 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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [Presentation] Logic Functions Realized Using Clockless Gates for Rapid Single-Flux-Quantum Circuits (2021)
  • Author(s): Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: The 23rd Workshop on Synthesis And System Integration of Mixed Information Technologies
  • 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
  • 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
• [Presentation] Phase-shift flux quantum bit with NbN/CuNi/NbN π-junction (2020)
  • 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)
• [Presentation] Extremely energy-efficient processing using superconductor circuits near physical limits (2020)
  • 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)
• [Presentation] Demonstration of flux-bias-free flux qubit with a ferromagnetic π junction (2020)
  • Author(s): Taro Yamashita, Kum Zuo, Yoshiro Urada, Wei Qiu, Hirotaka Terai, Akira Fujimaki, and Yasunobu Nakamura
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] 0-GHz datapath for parallel SFQ microprocessors based on gate-level-pipeline architecture (2020)
  • Author(s): Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Demonstration of π-junction-based SQUIDs with half-flux-quantum modulation periods for energy-efficient circuits (2020)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Investigation of timing parameters in single flux quantum circuits using low critical current junctions and low bias voltages (2020)
  • Author(s): Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] High-density routing with wire length matching for single-flux-quantum circuits using thin passive transmission lines (2020)
  • Author(s): Kei Kitamura Masamitsu Tanaka, Takahiro Kawaguchi, Ikki Nagaoka, Kazuyoshi Takagi, Akira Fujimaki, and Naofumi Takagi
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Analysis on half flux quantum circuits formed with π and conventional Josephson junctions (2020)
  • Author(s): Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Demonstration of a 52-GHz, energy-efficient, bit-parallel multiplier using low-voltage rapid single-flux-quantum logic (2020)
  • Author(s): Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Takatsugi Ono, Koji Inoue, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Proposal of SFQ annealer using π-junction-based SQUIDs operating at 4 K, Masayuki Higashi (2020)
  • Author(s): Daiki Hasegawa, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Study on pulse-driven, high-speed memory based on 0-π SQUIDs with passive transmission lines (2020)
  • Author(s): Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
• [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
• [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
• [Presentation] Static Timing Analysis of an RSFQ Circuit Considering Timing Jitter (2020)
  • Author(s): Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: The 33rd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] Efficient Timing Fault Simulation of Rapid Single-Flux-Quantum Logic Circuits Considering the Pipelined Behavior (2020)
  • Author(s): Shogo Nakamura, Kazuyoshi Takagi, Nobutaka Kito, and Naofumi Takagi
  • Organizer: The 33rd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] Investigation and measurement of narrow passive transmission lines for single flux quantum circuits (2020)
  • Author(s): Shunsuke Ikedo, Yuki Yamanashi, and Nobuyuki Yoshikawa
  • Organizer: The 33rd International Symposium on Superconductivity (ISS2020)
  • 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
• [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
• [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
• [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
  • 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
  • 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
  • Invited
• [Presentation] Development of 50-GHz, high-throughput rapid single-flux-quantum circuits toward ultra-fast, energy-efficient computing (2020)
  • 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
  • Int'l Joint Research / Invited
• [Presentation] Challenges to thermal limit, quantum limit, and high throughput based on SFQ circuits (2020)
  • Author(s): Akira Fujimaki, Masamitsu Tanaka, Nobuyuki Yoshikawa
  • Organizer: 2020 International Symposium on Superconductor Electronics
  • Int'l Joint Research / Invited
• [Presentation] Development of gate-level-pipelined SFQ circuits toward ultra-high-speed cryogenic computing (2020)
  • Author(s): Masamitsu Tanaka, Ikki Nagaoka, Koki Ishida, Kyosuke Sano, Taro Yamashita, Takatsugu Ono, Koji Inoue, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research / Invited
• [Presentation] Phase-shift flux qubit with a ferromagnetic π junction (2020)
  • 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
  • Int'l Joint Research
• [Presentation] NbN-based superconducting qubit on Si substrate (2020)
  • 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
  • Int'l Joint Research
• [Presentation] High-throughput gate-level-pipelined SFQ multipliers (2020)
  • Author(s): Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Koji Inoue, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Design of datapath for 8 bit parallel SFQ microprocessors with gate level pipelines (2020)
  • Author(s): Ryota Kashima, Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Simulation and comparison of the energy efficiency of half flux quantum circuits (2020)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Demonstration of SQUIDs with a period of half flux quantum in modulation patterns for half flux quantum circuits (2020)
  • Author(s): Yuto Takeshita, Feng Li, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Demonstration of SQUIDs with a period of half flux quantum in modulation patterns for half flux quantum circuits (2020)
  • Author(s): Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Development and evaluation of superconducting n anowire single photon detectors with dielectric multilayers (2020)
  • Author(s): Fumihiro China, Shigehito Miki, Masahiro Yabuno, Taro Yamashita, Hirotaka Terai
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Investigation of timing design by using low-power SFQ shift registers (2020)
  • Author(s): Manami Kuniyoshi, Ken Murase, Ikki Nagaoka, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] A Routing Method with Wire Length Matching for RSFQ Logic Circuits Using Thin PTLs (2020)
  • Author(s): Kei Kitamura, Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] A Comparison of Clocking Schemes for SFQ Circuits (2020)
  • Author(s): Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Introduction of Planarized High-speed Standard Process (PHSTP) to CRAVITY Digital Process (2020)
  • Author(s): Mutsuo Hidaka, Shuichi Nagasawa, and Kazumasa Makise
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Design and Simulation of Single-Flux-Quantum Multiply-Accumulator (2020)
  • Author(s): Z. Li, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Demonstration of an SFQ 8-symbol Complex Event Detector Corresponding to Regular Expressions (2020)
  • Author(s): Kazuma Akizuki, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • Int'l Joint Research
• [Presentation] Design of SFQ Convolutional Computation Processor for Convolutional Neural Network (2020)
  • Author(s): F. Ke, A. Ren, Y. Wang, O. Chen, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 13th Superconducting SFQ VLSI Workshop
  • 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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [Presentation] Developments of Nb-based Fabrication Process and Flip-chip Technology toward Superconductor Quantum Digital Systems (2019)
  • Author(s): Mutsuo Hidaka, Shuichi Nagasawa, and Kazumasa Makise
  • Organizer: 1st Workhop on Quantum and Classical Cryogenic Devices, Circuits, and Systems
  • Int'l Joint Research / Invited
• [Presentation] Numerical and experimental analysis on π-shifted SQUIDs for logic circuits and memories (2019)
  • Author(s): Akira Fujimaki, Yuto Takeshita, Daiki Hasegawa, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita
  • Organizer: 10th East Asia Symposium on Superconductor Electronics
  • Int'l Joint Research / Invited
• [Presentation] Design and demonstration of superconducting single flux quantum circuits operating around 50 GHz (2019)
  • Author(s): Akira Fujimaki
  • Organizer: 22nd Workshop on Synthesis And System Integration of Mixed Information Technologies
  • Int'l Joint Research / Invited
• [Presentation] Impulse-driven high-speed matrix memory based on π-shifted Josephson junctions (2019)
  • Author(s): Akira Fujimaki, Yuto Takeshita, Tomohiro Kamiya, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita
  • Organizer: 17th International Superconductive Electronics Conference
  • Int'l Joint Research / Invited
• [Presentation] Asynchronous Superconducting Digital Circuits (2019)
  • Author(s): Nobuyuki Yoshikawa
  • Organizer: 25th IEEE International Symposium on Asynchronous Circuits and Systems
  • Int'l Joint Research / Invited
• [Presentation] Energy consumption of half flux quantum circuits using π-shifted Josephson junctions (2019)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 32nd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] A Global Routing Method with Wire Length Budgeting for PTL Routing of SFQ Logic Circuits (2019)
  • Author(s): Kei Kitamura, Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: 32nd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] Scan Design with Clockless Logic Gates for SFQ Circuits (2019)
  • Author(s): Takahiro Kawaguchi, Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: 32nd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] Design and High-speed Test of an SFQ-based Single-chip FFT processor (2019)
  • Author(s): F. Ke, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 32nd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] Single-Flux-Quantum Parallel Multiplier Using Accumulator Unit (2019)
  • Author(s): Z. Li, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 32nd International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] NbN-based Superconducting Qubit on Si Substrate (2019)
  • Author(s): Sunmi Kim, Tomoko Fuse, Fumiki Yoshihara, Wei Qiu, Taro Yamashita, Ziqiao Ao, Kouichi Semba, Hirotaka Terai
  • Organizer: ISNTT2019 Symposium
• [Presentation] π-phase-shift Flux Qubit with a Ferromagnetic Josephson Junction (2019)
  • Author(s): Taro Yamashita, K. Zuo, Y. Urade, Q. Wei, Hirotaka Terai, Akira Fujimaki, Yasunobu Nakamura
  • Organizer: ISNTT2019 Symposium
• [Presentation] Development of NbN-based superconducting quantum circuit: 0-qubit and π-qubit (2019)
  • 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
  • Int'l Joint Research
• [Presentation] π-shifted SQUID based circuits and applications for classical computing and beyond (2019)
  • 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
  • Int'l Joint Research
• [Presentation] Demonstration of nTrons triggered by SFQ signals in monolithic ICs of Josephson junctions and nTrons (2019)
  • 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
  • Int'l Joint Research
• [Presentation] Test Pattern Generation for Timing Faults in Rapid Single-Flux-Quantum Circuits (2019)
  • Author(s): Kazuyoshi Takagi, Mikihiro Ono, Nobutaka Kito, and Naofumi Takagi
  • Organizer: The 22nd Workshop on Synthesis And System Integration of Mixed Information technologies
  • Int'l Joint Research
• [Presentation] Monolithic ICs of Josephson junctions and nTrons for large-capacity memories (2019)
  • Author(s): Kyosuke Sano, Naoki Kondo, Masamitsu Tanaka, Taro Yamashita, Masumi Inoue, Akira Fujimaki
  • Organizer: 14th European Conference on Applied Superconductivity
  • Int'l Joint Research
• [Presentation] Proposal of SQUIDs with a period of half flux quantum in modulation patterns (2019)
  • Author(s): Yuto Takeshita, Daiki Hasegawa, Tomohiro Kamiya, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 14th European Conference on Applied Superconductivity
  • Int'l Joint Research
• [Presentation] Superconducting flux qubit with NbN-based ferromagnetic π junction (2019)
  • Author(s): Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki and Yasunobu Nakamura
  • Organizer: 14th European Conference on Applied Superconductivity
  • Int'l Joint Research
• [Presentation] High-Speed Operation of a 13-bit 50-sample/period SFQ-based Sine Code Generator (2019)
  • Author(s): F. Ke, Yuki Yamanashi, T. Ortlepp, Nobuyuki Yoshikawa
  • Organizer: 14th European Conference on Applied Superconductivity
  • Int'l Joint Research
• [Presentation] Numerical analysis of low-power logic family based on half flux quantum using π-shifted Josephson junctions (2019)
  • Author(s): Masamitsu Tanaka, Tomohiro Kamiya, Yuto Takeshita, Yuta Yoshinomoto, Daiki Hasegawa, Kyosuke Sano, Taro Yamashita, Akira Fujimaki
  • Organizer: 17th International Superconductive Electronics Conference
  • 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 Logic (2019)
  • Author(s): Ikki Nagaoka, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Koji Inoue, Akira Fujimaki
  • Organizer: 17th International Superconductive Electronics Conference
  • 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, Akira Fujimaki
  • Organizer: 17th International Superconductive Electronics Conference
  • Int'l Joint Research
• [Presentation] Placement and Routing Methods Based on Mixed Wiring of JTLs and PTLs for RSFQ Circuits (2019)
  • Author(s): Takashi Dejima, *Kazuyoshi Takagi, and Naofumi Takagi
  • Organizer: 17th International Superconductive Electronics Conference
  • Int'l Joint Research
• [Presentation] Measurement of an SFQ complex event detector for complex event processing (2019)
  • Author(s): Kazuma Akizuki, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 17th International Superconductive Electronics Conference
  • Int'l Joint Research
• [Presentation] Demonstration of a single-flux-quantum microprocessor operating with a Josephson-CMOS hybrid memory (2019)
  • Author(s): Yuki Hironaka, T. Ortlepp, Yuki Yamanashi, Nobuyuki Yoshikawa
  • Organizer: 17th International Superconductive Electronics Conference
  • Int'l Joint Research
• [Presentation] Measurement of Single-Flux-Quantum Floating-Point Divider Based on Goldschmidt's Algorithm (2019)
  • Author(s): Yuki Yamanashi, A. Sanada, Nobuyuki Yoshikawa
  • Organizer: 17th International Superconductive Electronics Conference
  • Int'l Joint Research
• [Presentation] Phase-shift flux qubit with ferromagnetic π junction (2019)
  • Author(s): Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki and Yasunobu Nakamura
  • Organizer: 20th Anniversary of Superconducting Qubits
• [Presentation] NbN-based superconducting quantum circuit on Si substrate (2019)
  • 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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [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
• [Presentation] Design of a One-Instruction-Set SFQ Microprocessor for High-Speed Demonstration of SFQ/CMOS Hybrid System (2019)
  • Author(s): Y. Hironaka, Y. Yamanashi, N. Yoshikawa
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • 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 process (2019)
  • Author(s): F. Ke, Y. Yamanashi, T. Ortlepp, N. Yoshikawa
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • Int'l Joint Research
• [Presentation] Compact High Selectivity In-Line Topology Filter Based on LTS Technology (2019)
  • Author(s): Y. He, N. Takeuchi, N. Yoshikawa
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • Int'l Joint Research
• [Presentation] Road to Superconductor-Based World-Fastest Computer (2019)
  • 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)
  • Int'l Joint Research
• [Presentation] 0-p SQUID Based Matrix Memory Driven by SFQ Pulses (2019)
  • Author(s): Y. Takeshita, T. Kamiya, K. Sano, M. Tanaka, A. Fujimaki, T. Yamashita
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • Int'l Joint Research
• [Presentation] A Hierarchical Placement Method with Cell Clustering for Rapid-Single-Flux-Quantum Circuits (2019)
  • Author(s): T. Dejima, K.Takagi, N. Takagi
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • Int'l Joint Research
• [Presentation] A Global Routing Method with Wire Length Budgeting for SFQ Logic Circuits (2019)
  • Author(s): K. Kitamura, K.Takagi, N. Takagi
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • Int'l Joint Research
• [Presentation] Encoder/Decoder for the Compound Signal of Data and Clock (2019)
  • Author(s): T. Kawaguchi, K.Takagi, N. Takagi
  • Organizer: 12th Superconducting SFQ VLSI Workshop (SSV 2019)
  • 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
• [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
• [Presentation] Power-Controllable Superconducting AC/DC Converters for DC-Driven Energy- Efficient Single-Flux-Quantum Circuits (2018)
  • Author(s): A. Fujimaki, S. Taniguchi, H. Kato, H. Iwashita, T. Yamashita, M. Tanaka
  • Organizer: Applied Superconductivity Conference (ASC2018)
  • Int'l Joint Research / Invited
• [Presentation] 30-GHz Operation of Datapath for Bit-Parallel, Gate-Level-Pipelined Rapid Single- Flux-Quantum Microprocessors (2018)
  • 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)
  • Int'l Joint Research / Invited
• [Presentation] DC-Offset-Free Quantum Flux Parametron using Ferromagnet Phase Shift Elements (2018)
  • Author(s): M. Tanaka, H. Ito, S. Taniguchi, H. Iwashita, K. Sano, T. Yamashita, A. Fujimaki
  • Organizer: Applied Superconductivity Conference (ASC2018)
  • Int'l Joint Research
• [Presentation] Short turn-on-delay superconducting nanostructure transistors (2018)
  • Author(s): K. Sano, M. Suzuki, K. Maruyama, N. Kondo, M. Tanaka, T. Yamashita, M. Inoue, A. Fujimaki
  • Organizer: Applied Superconductivity Conference (ASC2018)
  • Int'l Joint Research
• [Presentation] Low-power half single flux quantum circuits based on π-shifted Josephson junctions (2018)
  • Author(s): T. Kamiya, Y. Takeshita, K. Sano, M. Tanaka, T. Yamashita, A. Fujimaki
  • Organizer: Applied Superconductivity Conference (ASC2018)
  • Int'l Joint Research
• [Presentation] Design and demonstration of an SFQ-based full-component singlechip FFT processor (2018)
  • Author(s): F. Ke, Y. Yamanashi, N. Yoshikawa
  • Organizer: Applied Superconductivity Conference (ASC2018)
  • Int'l Joint Research
• [Presentation] Design and evaluation of a one-instruction-set single-flux-quantum microprocessor for the demonstration of Josephson-CMOS hybrid system (2018)
  • Author(s): Y. Hironaka, Y. Yamanashi, N. Yoshikawa
  • Organizer: The 31st International Symposium on Superconductivity (ISS2018)
  • Int'l Joint Research
• [Presentation] Design and demonstration of an 8-bit 18-sample/cycle sine code generator using single-flux-quantum circuits (2018)
  • Author(s): F. Ke, Y. Yamanashi, T. Ortlepp, N. Yoshikawa
  • Organizer: The 31st International Symposium on Superconductivity (ISS2018)
  • Int'l Joint Research
• [Presentation] Numerical Analysis of Low-Power Half Single Flux Quantum Circuits Based on 0-π SQUIDs (2018)
  • Author(s): M. Tanaka, Y. Yoshinomoto, T. Kamiya, K. Sano, T. Yamashita, A. Fujimaki
  • Organizer: The 31st International Symposium on Superconductivity (ISS2018)
  • Int'l Joint Research
• [Presentation] Progress in DC-powered single-flux-quantum integrated circuits (2018)
  • Author(s): A. Fujimaki, K. Sano, T. Yamashita, M. Tanaka
  • Organizer: 4th International Workshop on Superconducting Sensors and Detectors (IWSSD 2018)
  • Int'l Joint Research / Invited
• [Presentation] New Circuits for Highly Sensitive Sensers and for Energy-Efficient Logics (2018)
  • Author(s): A. Fujimaki, T. Kamiya, K. Sano, T. Yamachita, M. Tanaka
  • Organizer: Workshop on the Future of Silicon Detector Technologies (FuTuRe II)
  • 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
• [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
• [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
• [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
• [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
• [Patent(Industrial Property Rights)] 可変超伝導位相シフタ、ダイオード素子および整流器 (2024)
  • Inventor(s): 李峰 田中雅光 藤巻朗
  • Industrial Property Rights Holder: 李峰 田中雅光 藤巻朗
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2024-013168
  • Filing Date: 2024
• [Funded Workshop] The Joint Workshop of 15th Superconducting SFQ VLSI Workshop (SSV 2022) and 4th Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2022) (2022)
• [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)
• [Funded Workshop] 13th Superconducting SFQ VLSI Workshop (2020)
• [Funded Workshop] 1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (2019)
• [Funded Workshop] 12th Superconducting SFQ VLSI Workshop (SSV 2019) (2019)