Large-scale superconducting spintronics quantum computing circuits toward the realization of quantum supremacy

• Project/Area Number: 19H05615
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Review Section: Broad Section C
• Research Institution: Tohoku University (2022-2023); Nagoya University (2019-2021)
• Principal Investigator: 山下 太郎 東北大学, 工学研究科, 教授 (60567254)
• Co-Investigator(Kenkyū-buntansha): 竹内 尚輝 国立研究開発法人産業技術総合研究所, 量子・AI融合技術ビジネス開発グローバル研究センター, 主任研究員 (00746472) ; 田中 雅光 名古屋大学, 工学研究科, 准教授 (10377864) ; 猪股 邦宏 国立研究開発法人産業技術総合研究所, 量子・AI融合技術ビジネス開発グローバル研究センター, 研究チーム長 (50525772) ; 宮嶋 茂之 国立研究開発法人情報通信研究機構, 未来ICT研究所神戸フロンティア研究センター, 主任研究員 (50708055)
• Project Period (FY): 2019-06-26 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥203,580,000 (Direct Cost: ¥156,600,000、Indirect Cost: ¥46,980,000); Fiscal Year 2023: ¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000); Fiscal Year 2022: ¥24,050,000 (Direct Cost: ¥18,500,000、Indirect Cost: ¥5,550,000); Fiscal Year 2021: ¥31,850,000 (Direct Cost: ¥24,500,000、Indirect Cost: ¥7,350,000); Fiscal Year 2020: ¥39,390,000 (Direct Cost: ¥30,300,000、Indirect Cost: ¥9,090,000); Fiscal Year 2019: ¥84,370,000 (Direct Cost: ¥64,900,000、Indirect Cost: ¥19,470,000)
• Keywords: 超伝導 / 量子回路 / ジョセフソン接合 / スピントロニクス / モノリシック

Outline of Research at the Start

量子計算分野において、古典計算機を凌駕する計算能力を表す「量子超越性」の実験的実証は、全世界的に喫緊の研究課題として注目されている。その実証には、量子回路の大規模化（量子ビット数の増加）を、コヒーレンス時間（量子状態を保持可能な時間）等の性能劣化なく達成することが必要不可欠である。本研究では、本研究チームが誇る大規模化可能なπ接合量子回路と超低消費電力性を有する半磁束量子回路という世界最高峰のコア技術を融合することで量子超越性の実証を目指す。

Outline of Annual Research Achievements

まずπ量子ビットについては、昨年度までに磁束バイアスフリー動作実証とマイクロ秒級の優れたコヒーレンス特性（量子寿命）達成に成功したが、その性能律速の要因を解明すべく、接合のエネルギー散逸を記述する理論モデルによる定量解析を行った。その結果、理論モデルにより実験と同等の量子寿命が得られることが分かり、性能決定の要因がπ接合自体のエネルギー散逸であることを特定した。以上を含め論文投稿を完了した。並行して量子寿命の向上に必須となる絶縁層付きπ接合も開発を進めπ接合実証に成功した。量子アルゴリズムSimultaneous Quantum Messages Protocolsを実装した多量子ビット回路については評価したが実証には至らなかった。次に昨年度実証した半磁束量子（HFQ）回路について、HFQ伝搬動作と低消費電力性実証に関する論文を出版した。また4量子ビット制御回路の作製と希釈冷凍機下での動作実証にも成功し、2000量子ビット級の制御回路への拡張性を示した。並行して、100 k量子ビット級の拡張性を有する交流断熱駆動型の新規多量子ビット制御回路も検討し、要素回路実証に成功した。そしてモノリシック回路については、最近接結合型の4つのπ量子ビットを1ユニット（全20ユニット）とし、実証した4量子ビット制御回路により駆動される80量子ビットモノリシック回路の作製に成功し、0.7μWという超低消費電力性と高周波配線の大幅削減を示した。大規模モノリシック回路の構成要素となる、制御回路とπ量子ビットのモノリシック回路を作製・評価し、磁束バイアスフリー動作、制御回路からの磁束量子パルスによる量子状態制御、そして量子ビット単体と同等の1.4マイクロ秒の優れた量子寿命の達成に成功した。以上により、低消費電力・配線数低減・高コヒーレンス・高非調和性を全て備えたモノリシック量子回路の創出を達成した。

Research Progress Status

令和5年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和5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] Control Circuits for Superconducting Qubits: (2024)
  • Author(s): TAKEUCHI Naoki、FUKETA Hiroshi、YAMASHITA Taro、YAMAMOTO Tsuyoshi
  • Journal Title: TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Volume: 59 Issue: 2 Pages: 71-79
  • DOI: 10.2221/jcsj.59.71
  • ISSN: 0389-2441, 1880-0408
  • Year and Date: 2024-03-20
  • Peer Reviewed / Open Access
• [Journal Article] Microwave characterization of tantalum superconducting resonators on silicon substrate with niobium buffer layer (2024)
  • Author(s): Urade Yoshiro、Yakushiji Kay、Tsujimoto Manabu、Yamada Takahiro、Makise Kazumasa、Mizubayashi Wataru、Inomata Kunihiro
  • Journal Title: APL Materials Volume: 12 Issue: 2
  • DOI: 10.1063/5.0165137
  • Peer Reviewed
• [Journal Article] NbN-based half-flux-quantum element for integration with superconducting qubits (2024)
  • Author(s): Naoki Takeuchi, Mikiya Naruse, Shigeyuki Miyajima, Duong Pham, Hirotaka Terai, Masamitsu Tanaka, Taro Yamashita
  • Journal Title: Applied Physics Letters Volume: 124 Issue: 15
  • DOI: 10.1063/5.0203046
  • Peer Reviewed
• [Journal Article] Numerical Study on Physical Reservoir Computing With Josephson Junctions (2024)
  • Author(s): Watanabe Kohki、Mizugaki Yoshinao、Moriya Satoshi、Yamamoto Hideaki、Yamashita Taro、Sato Shigeo
  • Journal Title: IEEE Transactions on Applied Superconductivity Volume: 34 Issue: 3 Pages: 1-4
  • DOI: 10.1109/tasc.2024.3350576
  • Peer Reviewed
• [Journal Article] Superconducting flux qubit with ferromagnetic Josephson pi junction operating at zero magnetic field (2024)
  • Author(s): Sunmi Kim, Leonid V. Abdurakhimov, Duong Pham, Wei Qiu, Hirotaka Terai, Sahel Ashhab, Shiro Saito, Taro Yamashita, Kouichi Semba
  • Journal Title: arXiv:2401.14597（Communications Materialsに投稿中） Volume: -
  • Open Access
• [Journal Article] NbN-based tunnel-type π-junctions for low-power half-flux-quantum circuits (2024)
  • Author(s): Duong Pham, Feng Li, Kenjiro Oba, Yuto Takeshita, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Journal Title: Superconductor Science and Technologyに2024年4月9日受理済み Volume: -
  • Peer Reviewed
• [Journal Article] Scalable quantum-bit controller using adiabatic superconductor logic (2024)
  • Author(s): Naoki Takeuchi, Taiki Yamae, Taro Yamashita, Tsuyoshi Yamamoto, and Nobuyuki Yoshikawa
  • Journal Title: arXiv:2310.06544（npj Quantum Informationに投稿中） Volume: -
  • Open Access
• [Journal Article] Quantum Microwave Parametric Interferometer (2023)
  • Author(s): Kronowetter F.、Fesquet F.、Renger M.、Honasoge K.、Nojiri Y.、Inomata K.、Nakamura Y.、Marx A.、Gross R.、Fedorov K.G.
  • Journal Title: Physical Review Applied Volume: 20 Issue: 2 Pages: 024049-024049
  • DOI: 10.1103/physrevapplied.20.024049
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Classical SPICE simulation of superconducting quantum circuits (2023)
  • Author(s): Tanamoto Tetsufumi、Ishikawa Toyofumi、Inomata Kunihiro、Masuda Shumpei、Omuma Tamio、Kawabata Shiro
  • Journal Title: Applied Physics Express Volume: 16 Issue: 3 Pages: 034501-034501
  • DOI: 10.35848/1882-0786/acc3d8
  • Peer Reviewed / Open Access
• [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] 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] 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] 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] 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] Parameter Design Method for the Adiabatic Quantum-Flux-Parametron Towards Ultra-Low-Power Computing (2022)
  • Author(s): 竹内 尚輝、山栄 大樹、鈴木 秀雄、吉川 信行
  • Volume: J105-C
  • Issue: 11
  • Pages: 329-338
  • DOI: 10.14923/transelej.2022JCI0003
  • ISSN: 1881-0217
  • Year and Date: 2022-11-01
  • Peer Reviewed / Open Access
• [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] Magnetic Josephson Junctions: New Phenomena and Physics with Diluted Alloy, Conventional Ferromagnet, and Multilayer Barriers (2021)
  • Author(s): Yamashita Taro
  • Journal Title: IEICE Transactions on Electronics Volume: E104.C Issue: 9 Pages: 422-428
  • DOI: 10.1587/transele.2020SUI0004
  • NAID: 130008082175
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2021-09-01
  • Peer Reviewed / Open Access
• [Journal Article] Superconductor Processor Architecture (2021)
  • Author(s): INOUE Koji、TANAKA Masamitsu、ISHIDA Koki
  • Journal Title: TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Volume: 56 Issue: 2 Pages: 87-93
  • DOI: 10.2221/jcsj.56.87
  • NAID: 130008001851
  • ISSN: 0389-2441, 1880-0408
  • Year and Date: 2021-03-20
  • 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] Enhanced coherence of all-nitride superconducting qubits epitaxially grown on silicon substrate (2021)
  • Author(s): Kim Sunmi、Terai Hirotaka、Yamashita Taro、Qiu Wei、Fuse Tomoko、Yoshihara Fumiki、Ashhab Sahel、Inomata Kunihiro、Semba Kouichi
  • Journal Title: Communications Materials Volume: 2 Issue: 1 Pages: 1-7
  • DOI: 10.1038/s43246-021-00204-4
  • Peer Reviewed / Open Access
• [Journal Article] Experimental quantum teleportation of propagating microwaves (2021)
  • Author(s): Fedorov Kirill G.、Renger Michael、Pogorzalek Stefan、Di Candia Roberto、Chen Qiming、Nojiri Yuki、Inomata Kunihiro、Nakamura Yasunobu、Partanen Matti、Marx Achim、Gross Rudolf、Deppe Frank
  • Journal Title: Science Advances Volume: 7 Issue: 52 Pages: 1-7
  • DOI: 10.1126/sciadv.abk0891
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Beyond the standard quantum limit for parametric amplification of broadband signals (2021)
  • Author(s): Renger M.、Pogorzalek S.、Chen Q.、Nojiri Y.、Inomata K.、Nakamura Y.、Partanen M.、Marx A.、Gross R.、Deppe F.、Fedorov K. G.
  • Journal Title: npj Quantum Information Volume: 7 Issue: 1 Pages: 1-7
  • DOI: 10.1038/s41534-021-00495-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [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] 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] 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] 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] 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] π phase shifter based on NbN-based ferromagnetic Josephson junction on a silicon substrate (2020)
  • Author(s): Yamashita Taro、Kim Sunmi、Kato Haruki、Qiu Wei、Semba Kouichi、Fujimaki Akira、Terai Hirotaka
  • Journal Title: Scientific Reports Volume: 10 Issue: 1 Pages: 13687-13687
  • DOI: 10.1038/s41598-020-70766-9
  • Peer Reviewed / Open Access
• [Journal Article] Secure quantum remote state preparation of squeezed microwave states (2019)
  • Author(s): Pogorzalek S.、Fedorov K. G.、Xu M.、Parra-Rodriguez A.、Sanz M.、Fischer M.、Xie E.、Inomata K.、Nakamura Y.、Solano E.、Marx A.、Deppe F.、Gross R.
  • Journal Title: Nature Communications Volume: 10 Issue: 1
  • DOI: 10.1038/s41467-019-10727-7
  • Peer Reviewed / Open Access / Int'l Joint Research
• [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
• [Presentation] NbN-based flux qubit with ferromagnetic π-junction (2024)
  • Author(s): Sunmi Kim, Leonid V. Abdurakhimov, Duong Pham, Wei Qiu, Hirotaka Terai, Sahel Ashhab1, Shiro Saito, Taro Yamashita, and Kouichi Semba
  • Organizer: The American Physical Society's March Meeting 2024
  • Int'l Joint Research
• [Presentation] Scalable superconducting flux quantum bits with large-area Josephson junctions (2024)
  • Author(s): Tokunoshin Uchida, Hiroki Kutsuma, Taro Yamashita
  • Organizer: PASPS-27
• [Presentation] 量子ビット応用に向けたアンダーダンプ型特性を有するNbN/AlN/CuNi/NbN接合 (2024)
  • Author(s): 栗原 大輝、本田 浩輝、沓間 弘樹、山下 太郎
  • Organizer: 第71回応用物理学会春季学術講演会
• [Presentation] MgO基板上に作製したコプレーナ線路共振器の損失評価 (2024)
  • Author(s): 渡邊 紘基、沓間 弘樹、金 鮮美、山下 太郎
  • Organizer: 第71回応用物理学会春季学術講演会
• [Presentation] πシフトジョセフソン接合を用いた単一磁束量子非破壊読み出しフリップフロップの動作実証 (2024)
  • Author(s): 出口創万, 上田伴春, 李峰, 田中雅光, 藤巻朗
  • Organizer: 第71回応用物理学会春季学術講演会
• [Presentation] Scalable and Flux-bias-free Superconducting Flux Quantum Bits (2023)
  • Author(s): Taro Yamashita
  • Organizer: MRM2023/IUMRS-ICA2023
  • Int'l Joint Research / Invited
• [Presentation] 超伝導スピントロニクスによるスケーラブルな超伝導量子回路 (2023)
  • Author(s): 山下太郎
  • Organizer: 第84回応用物理学会秋季学術講演会
  • Invited
• [Presentation] Novel superconducting flux quantum bits toward large-scale quantum circuits (2023)
  • Author(s): Taro Yamashita
  • Organizer: 15th international workshop on High Temperature Superconductors in High Frequency Fields (HTSHFF2023)
  • Int'l Joint Research / Invited
• [Presentation] 超伝導量子デバイスの基礎と最近の進展 (2023)
  • Author(s): 山下太郎
  • Organizer: 電子情報通信学会 超伝導エレクトロニクス研究専門委員会、夏の超伝導エレクトロニクスセミナー
  • Invited
• [Presentation] Superconductor Digital Circuits: Recent Progress and Quantum Applications (2023)
  • Author(s): Naoki Takeuchi
  • Organizer: International Network on Quantum Annealing 2023 (INQA 2023)
  • Int'l Joint Research / Invited
• [Presentation] Low-power operation of half-flux-quantum circuits (2023)
  • Author(s): Masamitsu Tanaka, Shoma Tanemura, Toranosuke Nakayama, Masayuki Higashi, Feng Li, and Akira Fujimaki
  • Organizer: 36th International Symposium on Superconductivity
  • Int'l Joint Research
• [Presentation] Design, fabrication, and measurement of capacitively-shunted π-flux qubit controlled by monolithically-integrated SFQ circuit (2023)
  • Author(s): Duong Pham, Tomoharu Ueda, Shigeyuki Miyajima, Hirotaka Terai, Kunihiro Inomata, Masamitsu Tanaka, Akira Fujimaki, and Taro Yamashita
  • Organizer: Joint workshop of QCCC2023, SSV2023, and IWSQMD2023
  • Int'l Joint Research
• [Presentation] Design of scalable self-shunted flux qubits with large-area Josephson junctions (2023)
  • Author(s): Tokunoshin Uchida, Hiroki Kutsuma, and Taro Yamashita
  • Organizer: Joint workshop of QCCC2023, SSV2023, and IWSQMD2023
  • Int'l Joint Research
• [Presentation] Fabrication process for superconducting devices based on nitride superconductors including ferromagnetic Josephson junction (2023)
  • Author(s): Shigeyuki Miyajima, Hirotaka Terai, Taro Yamashita, Duong Pham, Masamitsu Tanaka, Shigehito Miki
  • Organizer: Joint workshop of QCCC2023, SSV2023, and IWSQMD2023
  • Int'l Joint Research
• [Presentation] Energy Efficient Half-flux-quantum Circuit Aiming at Milli-kelvin Stage Operation (2023)
  • Author(s): Feng Li, Duong Pham, Yuto Takeshita, Shoma Tanemura, Masayuki Higashi, Taro Yamashita, Masamitsu Tanaka and Akira Fujimaki
  • Organizer: The 18th International Superconductive Electronics Conference (ISEC 2023)
  • Int'l Joint Research
• [Presentation] Flux-bias-free superconducting flux qubits with coplanar waveguide resonator (2023)
  • Author(s): Taro Yamashita, Kunihiro Inomata, Duong Pham, Hirotaka Terai
  • Organizer: 16th European Conference on Applied Superconductivity (EUCAS2023)
  • Int'l Joint Research
• [Presentation] Self-shunted flux qubit for scalable superconducting quantum computer (2023)
  • Author(s): Tokunoshin Uchida, Hiroki Kutsuma, Taro Yamashita
  • Organizer: 16th European Conference on Applied Superconductivity (EUCAS2023)
  • Int'l Joint Research
• [Presentation] Numerical study on physical reservoir computing with Josephson junctions (2023)
  • Author(s): Kohki Watanabe, Yoshinao Mizugaki, Satoshi Moriya, Hideaki Yamamoto, Taro Yamashita, Shigeo Sato
  • Organizer: 16th European Conference on Applied Superconductivity (EUCAS2023)
  • Int'l Joint Research
• [Presentation] Epitaxial tunnel junctions for nitride superconducting qubits (2023)
  • Author(s): Hirotaka Terai, Sunmi Kim, Taro Yamashita, Kunihiro Inomata, Fumiki Yoshihara, and Kouichi Semba
  • Organizer: 16th European Conference on Applied Superconductivity (EUCAS2023)
  • Int'l Joint Research
• [Presentation] Niobium-nitride-based superconducting flux qubit with π-phase shifter (2023)
  • Author(s): Sunmi Kim, Leonid V. Abdurakhimov, Duong Pham, Wei Qiu, Hirotaka Terai, Sahel Ashhab, Taro Yamashita, Shiro Saito, and Kouichi Semba
  • Organizer: 16th European Conference on Applied Superconductivity (EUCAS2023)
  • Int'l Joint Research
• [Presentation] New-generation superconducting flux quantum bits for scalable quantum computer (2023)
  • Author(s): Taro Yamashita
  • Organizer: Workshop Emerging Platforms for Quantum Computing
  • Int'l Joint Research
• [Presentation] Superconducting microwave resonators based on room-temperature-grown tantalum thin films (2023)
  • Author(s): Y. Urade, K. Yakushiji, M. Tsujimoto, T. Yamada, K. Makise, W. Mizubayashi, and K. Inomata
  • Organizer: SQA Conference 2023
  • Int'l Joint Research
• [Presentation] Characterization of a Josephson Traveling-Wave Parametric Amplifier with an AlOx Dielectric for Capacitors (2023)
  • Author(s): T. Yamada, Y. Urade, T. Ishikawa, M. Tsujimoto, G. Fujii, S. Nagasawa, Y. Nakashima, W. Mizubayashi, and K. Inomata
  • Organizer: Joint workshop of QCCC2023, SSV2023, and IWSQMD2023
• [Presentation] 超伝導自己シャント型磁束量子ビットの提案と検証 (2023)
  • Author(s): 内田徳之新、沓間弘樹、山下 太郎
  • Organizer: 第84回応用物理学会秋季学術講演会
• [Presentation] 窒化物ジョセフソン接合を用いたMerged-Element Transmon の設計 (2023)
  • Author(s): 渡邊紘基、栗原大輝、内田徳之新、沓間弘樹、山下太郎
  • Organizer: 第84回応用物理学会秋季学術講演会
• [Presentation] 超伝導量子ビット応用に向けた窒化物ジョセフソン接合の開発 (2023)
  • Author(s): 寺井弘高、サイスイリカンス アバパッリ、金鮮美、猪股邦宏、山下太郎、布施智子、吉原文樹、仙場浩一
  • Organizer: 第84回応用物理学会秋季学術講演会
• [Presentation] 窒化物系超伝導体に基づく磁性接合を含む集積回路プロセスの開発 (2023)
  • Author(s): 宮嶋茂之，寺井弘高，山下太郎，田中雅光，竹内尚輝，三木茂人
  • Organizer: 第84回応用物理学会秋季学術講演会
• [Presentation] π-π-π SQUIDにおける共振ステップの観測 (2023)
  • Author(s): 堀裕貴, 李峰, 中山彪之助, 東正志, 田中雅光, 藤巻朗
  • Organizer: 第84回応用物理学会秋季学術講演会
• [Presentation] 自己シャント型超伝導磁束量子ビットの提案と設計 (2023)
  • Author(s): 内田徳之新、沓間弘樹、山下太郎
  • Organizer: 日本物理学会第78回年次大会
• [Presentation] 多量子ビット制御に向けたNbNベース単一磁束量子スイッチ制御付き4 出力分岐回路 (2023)
  • Author(s): 上田伴春、宮嶋茂之、寺井弘高、Pham Duong、田中雅光、山下太郎、西村治道、藤巻朗
  • Organizer: 電子情報通信学会ソサエティ大会
• [Presentation] Niobium nitride based ferromagnetic Josephson junctions toward quantum applications (2023)
  • Author(s): Taro Yamashita
  • Organizer: The 11th East Asia Symposium on Superconductor Electronics (EASSE 2023)
  • Int'l Joint Research / Invited
• [Presentation] Recent progress in superconducting qubits with nitride superconductors (2023)
  • Author(s): H. Terai, S. Kim, T. Yamashita, K. Inomata, T. Fuse, F. Yoshihara, K. Semba
  • Organizer: The 11th East Asia Symposium on Superconductor Electronics (EASSE 2023)
  • Int'l Joint Research / Invited
• [Presentation] Superconducting flux quantum bits with scalable structures (2023)
  • Author(s): Taro Yamashita
  • Organizer: Research Workshop on Superconductivity and Quantum Technology
  • Invited
• [Presentation] Superconducting devices for quantum computing and detector applications (2023)
  • Author(s): Taro Yamashita
  • Organizer: International Workshop of Spin/Quantum Materials and Devices (IWSQMD)
  • Int'l Joint Research
• [Presentation] Superconducting qubits based on nitride superconductors (2023)
  • Author(s): Hirotaka Terai, Sunmi Kim, Taro Yamashita, Kunihiro Inomata, Tomoko Fuse, Fumiki Yoshihara, Kouichi Semba
  • Organizer: Research Workshop on Superconductivity and Quantum Technology
• [Presentation] Coherence properties of NbN-based superconducting flux qubit with π-phase shifter (2023)
  • Author(s): Sunmi Kim, Leonid V. Abdurakhimov, Duong Pham, Wei Qiu, Hirotaka Terai, Sahel Ashhab, Taro Yamashita, Shiro Saito, Kouichi Semba
  • Organizer: Research Workshop on Superconductivity and Quantum Technology
• [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, 寺井弘高, 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] 超伝導量子コンピューティングのための極低温測定システム (2023)
  • Author(s): 猪股邦宏
  • Organizer: 「半導体エンジニアのための量子コンピューティング入門」～超伝導量子ビットからクライオCMOSまで、基礎と最新の技術動向～
  • Invited
• [Presentation] Josephson Traveling-Wave Parametric Amplifier ~Fabrication and Characterization~ (2023)
  • Author(s): Kunihiro Inomata
  • Organizer: Research Workshop on Superconductivity and Quantum Technology
  • Invited
• [Presentation] 低温エレクトロニクス (2023)
  • Author(s): 田中雅光
  • Organizer: 応用物理学会シリコンテクノロジー分科会横断的研究集会
  • Invited
• [Presentation] 半磁束量子回路のパラメータ設計指針 (2023)
  • Author(s): 種村匠真, 中山彪之助, 竹下雄登, 李峰, 田中雅光, 藤巻朗
  • Organizer: 電子情報通信学会総合大会
• [Presentation] 新規量子デバイス創出に向けた超伝導スピントロニクス技術 (2022)
  • Author(s): 山下太郎
  • Organizer: 第28回渦糸物理ワークショップ（28th Vortex Physics Workshop Japan）
  • Invited
• [Presentation] Novel ferromagnet/superconductor hybrid quantum devices (2022)
  • Author(s): Taro Yamashita
  • Organizer: 2022 Japan-Taiwan Advanced Quantum Technology Research and Development Workshop
  • Int'l Joint Research / Invited
• [Presentation] 窒化物超伝導量子ビットの研究開発 (2022)
  • Author(s): 寺井 弘高, 金 鮮美, 猪股 邦宏, 山下 太郎, 布施 智子, 吉原 文樹, アシュハブ サヘル, 仙場 浩一
  • Organizer: 電子情報通信学会ソサイエティ大会
  • Invited
• [Presentation] Coherence properties of NbN-based superconducting qubits (2022)
  • Author(s): Sunmi Kim, Hirotaka Terai, Taro Yamashita, Wei Qiu, Tomoko Fuse, Fumiki Yoshihara, Sahel Ashhab,Kunihiro Inomata, and Kouichi Semba
  • Organizer: The 15th Asia Pacific Physics Conference (APPC15)
  • Int'l Joint Research / Invited
• [Presentation] All-nitride superconducting qubits epitaxially grown on silicon substrate (2022)
  • Author(s): Sunmi Kim, Hirotaka Terai, Taro Yamashita, Wei Qiu, Tomoko Fuse, Fumiki Yoshihara, Sahel Ashhab, Kunihiro Inomata, Kouichi Semba
  • Organizer: Workshop on Innovative Nanoscale Devices and Systems (WINDS) 2022
  • Int'l Joint Research
• [Presentation] NbN-based half-flux-quantum SQUID with hybrid structures of 0- and π-junctions (2022)
  • Author(s): Taro Yamashita, Yuto Takeshita, Masamitsu Tanaka, Duong Pham, Shigeyuki Miyajima, Hirotaka Terai, and Akira Fujimaki
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] NbN-based half-flux-quantum circuits with superconductor/insulator/ferromagnet/superconductor junctions (2022)
  • Author(s): Duong Pham, Riku Sugimoto, Kenjiro Oba, Feng Li, Yuto Takeshita, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] Design and characterization of a superconducting flux qubit with a π phase shifter (2022)
  • Author(s): Kunihiro Inomata, Hirotaka Terai, Duong Pham and Taro Yamashita
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] Fabrication Process for Monolithic Integration of Nitride Superconductor-Based Superconducting Qubit with Single Flux Quantum Control Circuit (2022)
  • Author(s): Shigeyuki Miyajima, Taro Yamashita, Masamitsu Tanaka, Naoki Takeuchi, Kunihiro Inomata, and Hirotaka Terai
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] A new material platform with nitride superconductors for superconducting qubits (2022)
  • Author(s): Hirotaka Terai, Sunmi Kim, Qiu Wei, Taro Yamashita, Kunihiro Inomata, Tomoko Fuse, Fumiki Yoshihara, and Koichi Semba
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] The Power Efficient Half-Flux-Quantum Circuits based on π-π-π SQUIDs Aiming at the Control of Qubit Circuits at 10 mK Stage (2022)
  • Author(s): Feng Li, Duong Pham, Yuto Takeshita, Masayuki Higashi, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] Demonstration of selective access of impulse-driven, multi-bits memory based on 0-π SQUIDs (2022)
  • Author(s): Yuto Takeshita, Hinata Fujisawa, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] Analysis of the effect of 0-π SQUIDs for enhancing mutual coupling (2022)
  • Author(s): Masayuki Higashi, Yuto Takeshita, Kento Kato, Hinata Fujisawa, Feng Li, Masamitsu Tanaka, Taro Yamashita, and Akira Fujimaki
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] Recent progress in the development of NbN/PdNi/NbN π junctions for quantum circuits (2022)
  • Author(s): Duong Pham, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: The 2022 JSPS 146th Committee International Symposium on Superconductor Electronics jointed with SSV2022 and QCCC2022
  • Int'l Joint Research
• [Presentation] Design of capacitively shunted NbN-based flux qubits with π phase shifter (2022)
  • Author(s): Duong Pham, Kunihiro Inomata, Hirotaka Terai, Taro Yamashita
  • Organizer: 第28回渦糸物理ワークショップ（28th Vortex Physics Workshop Japan）
• [Presentation] 希釈冷凍機下における窒化ニオブジョセフソン接合特性の評価 (2022)
  • Author(s): 上田伴春，田中雅光，堀裕貴，中山彪之助, 山下太郎, 藤巻朗
  • Organizer: 2022年度秋季低温工学・超電導学会
• [Presentation] Si(100) 基板上に成長した TiN 薄膜の均一性評価 (2022)
  • Author(s): 寺井弘高, 猪股邦宏, 小林篤, 藤岡洋, 芳中大樹, 小玉剛史, 菱田有二, 金鮮美, 山下太郎, 布施智子, 吉原文樹, 仙場浩一
  • Organizer: 第83回応用物理学会秋季学術講演会
• [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] 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: 電子情報通信学会ソサイエティ大会
• [Presentation] Cryogenic RF components for SC qubit characterization (2022)
  • Author(s): Kunihiro Inomata
  • Organizer: RIKEN-NICT-East Asia Receiver Joint Workshop
  • Int'l Joint Research / Invited
• [Presentation] 量子ビット評価のための極低温マイクロ波コンポーネント (2022)
  • Author(s): 猪股邦宏
  • Organizer: 電子情報通信学会ソサイエティ大会
  • 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: 電子情報通信学会ソサイエティ大会
  • Invited
• [Presentation] Optimization of half flux quantum circuits composed of π-shift and conventional Josephson junctions (2022)
  • Author(s): Shoma Tanemura, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: Applied Superconductivity Conference 2022 (ASC2022)
  • Int'l Joint Research
• [Presentation] Demonstration of non-destructive readout of impulse-driven memory cell based on 0-π squids (2022)
  • Author(s): Hinata Fujisawa, Yuto Takeshita, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Akira Fujimaki
  • Organizer: The 2022 JSPS 146th Committee International Symposium on Superconductor Electronics jointed with SSV2022 and QCCC2022
  • Int'l Joint Research
• [Presentation] Analysis of single-π-junction SQUIDs acting as a giant inductance (2022)
  • Author(s): Masayuki Higashi, Feng Li, Yuto Takeshita, Masamitsu Tanaka, Akira Fujimaki
  • Organizer: The 2022 JSPS 146th Committee International Symposium on Superconductor Electronics jointed with SSV2022 and QCCC2022
  • Int'l Joint Research
• [Presentation] Demonstration of writing operation of 0-π-SQUID-based memory cells using only impulse-shaped voltage pulses (2022)
  • Author(s): Yuto Takeshita, Hinata Fujisawa, Masayuki Higashi, Feng Li, Masamitsu Tanaka, Akira Fujimaki
  • Organizer: The 2022 JSPS 146th Committee International Symposium on Superconductor Electronics jointed with SSV2022 and QCCC2022
  • Int'l Joint Research
• [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): 種村匠真, 竹下雄登, 李峰, 田中雅光, 藤巻朗
  • Organizer: 電子情報通信学会ソサイエティ大会
• [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] NbNベース半磁束量子回路によるトグルフリップフロップ回路の設計と作製 (2022)
  • Author(s): 杉本理駆、大場絢次郎、Pham Duong、田中雅光、山下太郎、藤巻朗
  • Organizer: 第69回応用物理学会春季学術講演会
• [Presentation] 量子ビットとのモノリシック実装に向けたNbNベース超低消費電力単一磁束量子回路の設計 (2022)
  • Author(s): 中山虎之助、上田伴春、田中雅光、山下太郎、藤巻朗
  • Organizer: 第69回応用物理学会春季学術講演会
• [Presentation] 半磁束量子回路の回路パラメータ最適化 (2022)
  • Author(s): 種村匠真、田中雅光、山下太郎、藤巻朗
  • Organizer: 2022年電子情報通信学会総合大会
• [Presentation] 超伝導量子ビット制御に向けた窒化物系超伝導集積回路プロセスの開発 (2022)
  • Author(s): 宮嶋茂之、山下太郎、田中雅光、竹内尚輝、寺井弘高
  • Organizer: 第69回応用物理学会春季学術講演会
• [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 Pd89Ni11 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] 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] NbN-based ferromagnetic π-junctions and their application to quantum circuits (2021)
  • Author(s): Taro Yamashita
  • Organizer: Spintronics XIV
  • Int'l Joint Research / Invited
• [Presentation] Low-power half-flux-quantum circuits and the fabrication process based on ferromagnetic SFIS Josephson junction (2021)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 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)
  • 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 Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 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 Joint Workshop of 14th Superconducting SFQ VLSI Workshop (SSV 2021) and 3rd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2021)
  • Int'l Joint Research
• [Presentation] Superconducting Quantum Circuits toward Demonstration of Quantum Advantage in Simultaneous Quantum Messages Protocols (2021)
  • Author(s): Taro Yamashita, Pham Duong, Masamitsu Tanaka, Kunihiro Inomata, Harumichi Nishimura
  • Organizer: 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)
  • Int'l Joint Research
• [Presentation] Calculation of the energy band diagram for NbN based superconducting flux qubit (2021)
  • Author(s): K. Inomata, H. Terai, and T. Yamashita
  • Organizer: 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)
  • Int'l Joint Research
• [Presentation] Superconducting qubit based on nitride superconductor and its monolithic integration with SFQ control circuit (2021)
  • Author(s): S. Miyajima, T. Yamashita, K. Inomata, and H. Terai
  • Organizer: 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)
  • Int'l Joint Research
• [Presentation] All-nitride superconducting qubit on silicon substrate (2021)
  • Author(s): S. Kim, H. Terai, T. Yamashita, W. Qui, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, K. Semba
  • Organizer: 34th International Symposium on Superconductivity (ISS2021)
  • Int'l Joint Research / Invited
• [Presentation] Enhanced Coherence of All-nitride Superconducting Qubit on a Silicon Substrate (2021)
  • Author(s): S. Kim, H. Terai, T. Yamashita, W. Qui, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, K. Semba
  • Organizer: International Symposium on Novel maTerials and quantum Technologies (ISNTT2021)
  • Int'l Joint Research
• [Presentation] Superconducting qubits with nitride Josephson junctions (2021)
  • Author(s): S. Kim, H. Terai, T. Yamashita, W. Qui, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, K. Semba
  • Organizer: 8th RIKEN Quantum Computing (RQC) Seminar
  • Invited
• [Presentation] Low-Energy, Low-Current Adiabatic Quantum-Flux-Parametron Circuits for Sub-Kelvin Operation (2021)
  • Author(s): N. Takeuchi, T. Yamae, M. Naruse, and N. Yoshikawa
  • Organizer: 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)
  • Int'l Joint Research
• [Presentation] インパルス駆動型マルチビットメモリの作製と実証 (2021)
  • Author(s): 竹下雄登、藤澤日向、加藤健人、東正志、李峰、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] インパルス信号による超伝導マトリクスメモリの内部状態の読み出し (2021)
  • Author(s): 加藤健人、竹下雄登、藤澤日向、東正志、李峰、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 高透磁率を得るためのπ接合を用いた人工スピン系の提案 (2021)
  • Author(s): 東正志、竹下雄登、藤澤日向、加藤健人、李峰、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 磁性ジョセフソン接合を用いたインパルス駆動型超伝導メモリセルの動作実証 (2021)
  • Author(s): 藤澤日向、竹下雄登、加藤健人、東正志、李峰、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 量子ビット応用に向けた絶縁層を含む強磁性ジョセフソン接合の開発 (2021)
  • Author(s): 大場絢次郎、杉本理駆、Pham Duong、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 半磁束量子を利用した小面積Tフリップフロップの解析 (2021)
  • Author(s): 中村祐介、竹下雄登、東正志、李峰、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] π-π-π SQUIDに基づく半磁束量子Tフリップフロップ (2021)
  • Author(s): 李峰、竹下雄登、東正志、田中雅光、山下太郎、藤巻朗
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 窒化物π接合を用いた磁束型超伝導量子ビットの研究進展 (2021)
  • Author(s): 山下太郎
  • Organizer: 超伝導エレクトロニクス研究会・東北大学電気通信研究所共同プロジェクト
  • Invited
• [Presentation] π-phase shift in NbN-based Josephson junctions with weak ferromagnet Pd89Ni11 interlayer (2021)
  • Author(s): Pham Duong, Riku Sugimoto, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 超伝導エレクトロニクス研究会
• [Presentation] 磁場変調周期が半磁束量子となるSQUIDの評価 (2021)
  • Author(s): 竹下雄登、東正志、李峰、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] 超伝導位相制御素子の量子回路応用 (2021)
  • Author(s): 山下太郎
  • Organizer: 第1回超伝導真空領域推進研究会
  • Invited
• [Presentation] 超伝導量子ビットの基礎 (2021)
  • Author(s): 猪股邦宏
  • Organizer: 第24回ASCOTセミナー
  • Invited
• [Presentation] NbN-based Josephson junction with PdNi-ferromagnetic barrier (2021)
  • Author(s): Duong Pham, Riku Sugimoto, Hayate Nakamura, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: American Physical Society (APS) March meeting
  • Int'l Joint Research
• [Presentation] Capacitively shunted flux qubit based on epitaxially grown NbN/AlN/NbN Josephson junctions on Si substrate (2021)
  • Author(s): Sunmi Kim, Hirotaka Terai, Taro. Yamashita, Wei Qiu, Tomoko Fuse, Fumiki Yoshihara, Kunihiro Inomata, Kouichi Semba
  • Organizer: American Physical Society (APS) March meeting
  • Int'l Joint Research
• [Presentation] Flux-driven impedance-matched Josephson parametric amplifier with improved pump (2021)
  • Author(s): Yoshiro Urade, Kun Zuo, Syotaro Baba, C. W. Sandbo Chang, Koh-ichi Nittoh, Kunihiro Inomata, Zhirong Lin, Tsuyoshi Yamamoto, Yasunobu Nakamura
  • Organizer: American Physical Society (APS) March meeting
  • 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] 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] NbN/PdNi/NbN 接合におけるジョセフソン臨界電流の強磁性膜厚依存性 (2021)
  • Author(s): 杉本理駆, Pham Duong, 中村颯, 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] 超伝導回路を用いた量子誤り訂正向けオンライン復号器の提案 (2021)
  • Author(s): 上野洋典, 近藤正章, 田中雅光, 鈴木泰成, 田渕豊
  • Organizer: 情報処理学会第2回量子ソフトウェア研究発表会
• [Presentation] インピーダンス整合型広帯域ジョセフソンパラメトリック増幅器のポンプ電力効率化 (2021)
  • Author(s): 浦出芳郎, Kun Zuo, 馬場正太郎, C. W. Sandbo Chang, 日塔光一, 猪股邦宏, Zhirong Lin, 山本剛, 中村泰信
  • Organizer: 電子情報通信学会 超伝導エレクトロニクス研究会
• [Presentation] マイクロ波光子を介した個体量子ビットの量子インターコネクション (2020)
  • Author(s): 猪股邦宏
  • Organizer: 応用物理学会量子情報光学研究会
  • Invited
• [Presentation] 断熱磁束量子パラメトロン -様々な情報システムへの応用と今後の展望- (2020)
  • Author(s): 竹内尚輝
  • Organizer: 日本学術振興会超伝導エレクトロニクス第146委員会・合同分科会
  • Invited
• [Presentation] 50-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, Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research / Invited
• [Presentation] 超伝導デバイスを用いた量子計算回路 (2020)
  • Author(s): 山下太郎
  • Organizer: 電気学会基礎・材料・共通部門大会
  • Invited
• [Presentation] Phase-shift flux quantum bit with NbN/CuNi/NbN π-junction (2020)
  • Author(s): Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki, Yasunobu Nakamura
  • Organizer: 2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)
  • Int'l Joint Research
• [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)
  • Int'l Joint Research
• [Presentation] Quantum Error Correction with a Superconducting Decoder (2020)
  • Author(s): Yosuke Ueno, Masaaki Kondo, Masamitsu Tanaka, Yasunari Suzuki, Yutaka Tabuchi
  • Organizer: 2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)
  • Int'l Joint Research
• [Presentation] Adiabatic quantum-flux-parametron: ultra-low-power superconductor logic for cryogenic signal processing (2020)
  • Author(s): Naoki Takeuchi, C. L. Ayala, O. Chen, Y. He, Nobuyuki Yoshikawa
  • Organizer: 2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020)
  • Int'l Joint Research
• [Presentation] Demonstration of flux-bias-free flux qubit with a ferromagnetic π junction (2020)
  • Author(s): Taro Yamashita, Kun Zuo, Yoshiro Urade, Wei Qiu, Hirotaka Terai, Akira Fujimaki, Yasunobu Nakamura
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] Superconducting qubit based on fully epitaxial NbN/AlN/NbN junctions on Si substrate (2020)
  • Author(s): Hirotaka Terai, Wei Qiu, Sunmi Kim, Tomoko Fuse, Fumiki Yoshihara, Taro Yamashita, Kouichi Semba
  • 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, Akira Fujimaki
  • 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, 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 (2020)
  • Author(s): Masayuki Higashi, Daiki Hasegawa, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, 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, 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, Koki Ishida, Masamitsu Tanaka, Kyosuke Sano, Taro Yamashita, Takatsugu Ono, Koji Inoue, 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, Akira Fujimaki
  • Organizer: 2020 Applied Superconductivity Conference (ASC 2020)
  • Int'l Joint Research
• [Presentation] 単一磁束量子回路による量子計算向け情報処理の可能性 (2020)
  • Author(s): 田中雅光
  • Organizer: 電気学会「量子コンピュータ周辺回路としての低温デジタル回路活用に関する調査専門委員会」第2回研究会
• [Presentation] π位相シフターを持つNbNベース超伝導量子ビットの開発 (2020)
  • Author(s): 金鮮美, 山下太郎, 加藤悠輝, 丘偉, 布施智子, 吉原文樹, 仙場浩一, 藤巻朗, 寺井弘高
  • Organizer: 電子情報通信学会 超伝導エレクトロニクス研究会
• [Presentation] PdNi障壁層を用いたNbNベース強磁性ジョセフソン接合の作製と評価 (2020)
  • Author(s): 杉本理駆, 中村颯, Pham Duong, 田中雅光, 山下太郎, 藤巻朗
  • Organizer: 電子情報通信学会 超伝導エレクトロニクス研究会
• [Presentation] π位相シフターを持つNbNベース超伝導量子ビットの開発 (2020)
  • Author(s): 金鮮美，山下太郎，寺井弘高，丘偉，布施智子，吉原文樹，仙場浩一
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] 半磁束量子回路の実現に向けた基本素子の作製 (2020)
  • Author(s): 長谷川大輝, 加藤健人, 東正志, 竹下雄登, 李峰, 田中雅光, 山下太郎, 藤巻朗
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] π位相シフタに向けたコバルト障壁層をもつ強磁性ジョセフソン接合の作製と評価 (2020)
  • Author(s): 中村颯, 杉本理駆, Pham Duong, 田中雅光, 山下太郎, 藤巻朗
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] SFQアニーラにおける隣接するスピン間の相互作用の影響 (2020)
  • Author(s): 東正志, 長谷川大輝, 竹下雄登, 李峰, 田中雅光, 山下太郎, 藤巻朗
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] SFQパルス駆動型超伝導メモリ実現に向けたメモリセルの静特性評価 (2020)
  • Author(s): 竹下雄登, 李峰, 長谷川大輝, 加藤健人, 田中雅光, 山下太郎, 藤巻朗
  • Organizer: 第81回応用物理学会秋季学術講演会
• [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] 強磁性π状態による位相制御 (2020)
  • Author(s): 山下太郎
  • Organizer: 電子・光コヒーレント変換研究会
  • 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 (SSV 2020)
  • 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: American 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: American Physical Society (APS) March meeting 2020
  • 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 (SSV2020)
  • 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 (SSV2020)
  • Int'l Joint Research
• [Presentation] Fabrication of magnetic Josephson junctions on Nb 4 layer structure for large scale half flux quantum circuits (2020)
  • Author(s): Daiki Hasegawa, Yuto Takeshita, Feng Li, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 13th Superconducting SFQ VLSI Workshop (SSV2020)
  • Int'l Joint Research
• [Presentation] Energy consumption of half flux quantum circuits using π-shifted Josephson junctions (2020)
  • Author(s): Feng Li, Yuto Takeshita, Daiki Hasegawa, Kyosuke Sano, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
  • Organizer: 32nd International Symposium on Superconductivity (ISS 2020)
  • Int'l Joint Research
• [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] Impedance-matched Josephson parametric amplifier using open stubs as shunt capacitance (2020)
  • Author(s): Y. Urade, K. Zuo, K. Inomata, Z.R. Lin, T. Yamamoto, and Y. Nakamura
  • Organizer: APS March meeting 2020
  • Int'l Joint Research
• [Presentation] Adiabatic Quantum-Flux-Parametron: Recent Progress and Applications (2020)
  • Author(s): N. Takeuchi, C. L. Ayala, O. Chen, Y. He, and N. Yoshikawa
  • Organizer: 13th Superconducting SFQ VLSI Workshop (SSV2020)
  • Int'l Joint Research / Invited
• [Presentation] Superconducting quantum circuit with ferromagnetic Josephson junctions (2019)
  • Author(s): Taro Yamashita
  • Organizer: 応用物理学会量子情報グループ研究会
  • 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 (EASSE 2019)
  • 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 (ISEC 2019)
  • Int'l Joint Research / Invited
• [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
  • Int'l Joint Research
• [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
  • Int'l Joint Research
• [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 (QCCC 2019)
  • 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 (QCCC 2019)
  • 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 (EUCAS 2019)
  • Int'l Joint Research / Invited
• [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: Superconducting Quantum Devices 2019 (SQD19)
  • 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 (ISEC2019)
  • 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 (ISEC2019)
  • 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 (SQ20th)
  • Int'l Joint Research
• [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 (SQ20th)
  • Int'l Joint Research
• [Presentation] 超伝導量子ビットに向けたNbN/AlN/CuNi/NbN強磁性ジョセフソン接合の作製 (2019)
  • Author(s): 加藤悠輝, 中村颯, 田中雅光, 山下太郎, 藤巻朗
  • Organizer: 電子情報通信学会 超伝導エレクトロニクス研究会
• [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，Ziqiao Ao，仙場浩一，寺井弘高
  • Organizer: 日本物理学会 2019年秋季大会
• [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] Single Microwave-Photon Detector based on Dressed State Engineering (2019)
  • Author(s): K. Inomata
  • Organizer: 2019 IEEE MTT-S International Wireless Symposium
  • Int'l Joint Research / Invited
• [Presentation] Real-time detection of an itinerant microwave photon using dressed-state engineering (2019)
  • Author(s): Z.R. Lin, S. Masuda, K. Inomata, K. Koshino, T. Yamamoto, and Y. Nakamura
  • Organizer: 20th Anniversary of Superconducting Qubits (SQ20th)
  • Int'l Joint Research
• [Presentation] Development of broadband flux-driven Josephson parametric amplifiers based on external impedance engineering (2019)
  • Author(s): Y. Urade, K. Zuo, K. Inomata, T. Yamamoto, and Y. Nakamura
  • Organizer: 20th Anniversary of Superconducting Qubits (SQ20th)
  • Int'l Joint Research
• [Presentation] Broadband Josephson parametric amplifier for multiplexed readout of superconducting qubitsw (2019)
  • Author(s): Y. Urade, K. Zuo, K. Inomata, Z.R. Lin, T. Yamamoto, and Y. Nakamura
  • Organizer: Topical Conference on Quantum Computing 2019 (TCQC 2019)
  • Int'l Joint Research
• [Presentation] Adiabatic quantum-flux-parametron: recent progress and possibility for quantum applications (2019)
  • Author(s): N. Takeuchi, C. L. Ayala, O. Chen, Y. He, and N. Yoshikawa
  • Organizer: 1st workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2019)
  • Int'l Joint Research
• [Remarks] 山下研究室ホームページ
  • URL: https://super.apph.tohoku.ac.jp/
• [Remarks] 研究室ホームページ（研究代表者、名古屋大学）
  • URL: http://www.super.nuee.nagoya-u.ac.jp/
• [Patent(Industrial Property Rights)] 超伝導量子回路用素子及び超伝導量子計算機 (2023)
  • Inventor(s): 山下太郎、内田徳之新
  • Industrial Property Rights Holder: 山下太郎、内田徳之新
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2023-019627
  • Filing Date: 2023
• [Funded Workshop] Joint workshop of QCCC2023, SSV2023, and IWSQMD2023 (2023)
• [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] 2nd Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2020) (2020)
• [Funded Workshop] 1st workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC 2019), 名古屋大学, 2019年11月12-13日 (2019)