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Research on decoherence and quantum technologies

Research Project

Project/Area Number 21K18592
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionTohoku University

Principal Investigator

Otsuka Tomohiro  東北大学, 材料科学高等研究所, 准教授 (50588019)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords量子ドット / ナノ・マイクロデバイス / デコヒーレンス / 量子情報 / 量子センシング
Outline of Research at the Start

現実世界の量子系においては、量子状態が壊れるデコヒーレンスが存在し、量子系を活用していく上での問題となっている。しかしデコヒーレンスをうまく利用すれば、有用な量子技術の要素として活用できる可能性もある。そこで本研究では、操作性の良い、強いデコヒーレンスを導入可能である半導体量子ドット系を用いて、デコヒーレンスについてその物理解明を進める。そしてこの知見を元に、量子センシングや量子情報処理に向けたデコヒーレンスを活用した量子技術を研究する。

Outline of Final Research Achievements

Decoherence, which induces the breakdown of quantum states, is currently unavoidable in realistic quantum systems and poses a challenge in utilizing quantum systems. However, if we can utilize this decoherence, it could potentially be used as a valuable component in quantum technology. In this study, we investigated decoherence using semiconductor quantum dot systems, in which we can induce controlled decoherence. We also explored quantum technologies that make use of this decoherence.

Academic Significance and Societal Importance of the Research Achievements

本研究により、半導体量子ドット系におけるデコヒーレンスに関連する現象の物理解明や、新しい半導体量子系材料の可能性開拓、そしてこれらを活用した量子技術についての研究を進めることができた。これらの成果は、半導体量子ドット系を用いた新しい量子技術に貢献するものであり、量子コンピューティングや量子センシング分野での応用が期待される。また将来的な大規模量子計算等に向けた量子技術の発展にも貢献することが期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (18 results)

All 2024 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 4 results) Presentation (12 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results)

  • [Journal Article] Visual explanations of machine learning model estimating charge states in quantum dots2024

    • Author(s)
      Muto Yui、Nakaso Takumi、Shinozaki Motoya、Aizawa Takumi、Kitada Takahito、Nakajima Takashi、Delbecq Matthieu R.、Yoneda Jun、Takeda Kenta、Noiri Akito、Ludwig Arne、Wieck Andreas D.、Tarucha Seigo、Kanemura Atsunori、Shiga Motoki、Otsuka Tomohiro
    • Journal Title

      APL Machine Learning

      Volume: 2 Issue: 2 Pages: 026110-026110

    • DOI

      10.1063/5.0193621

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Wide dynamic range charge sensor operation by high-speed feedback control of radio-frequency reflectometry2023

    • Author(s)
      Fujiwara Yoshihiro、Shinozaki Motoya、Matsumura Kazuma、Noro Kosuke、Tataka Riku、Sato Shoichi、Kumasaka Takeshi、Otsuka Tomohiro
    • Journal Title

      Applied Physics Letters

      Volume: 123 Issue: 21 Pages: 213502-213502

    • DOI

      10.1063/5.0167212

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Radio-Frequency Reflectometry in Bilayer Graphene Devices Utilizing Microscale Graphite Back-Gates2023

    • Author(s)
      Johmen Tomoya、Shinozaki Motoya、Fujiwara Yoshihiro、Aizawa Takumi、Otsuka Tomohiro
    • Journal Title

      Physical Review Applied

      Volume: 20 Issue: 1 Pages: 014035-014035

    • DOI

      10.1103/physrevapplied.20.014035

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Channel length dependence of the formation of quantum dots in GaN/AlGaN FETs2023

    • Author(s)
      Matsumura Kazuma、Abe Takaya、Kitada Takahito、Kumasaka Takeshi、Ito Norikazu、Tanaka Taketoshi、Nakahara Ken、Otsuka Tomohiro
    • Journal Title

      Applied Physics Express

      Volume: 16 Issue: 7 Pages: 075003-075003

    • DOI

      10.35848/1882-0786/ace415

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonlinear conductance in nanoscale CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis2023

    • Author(s)
      Shinozaki Motoya、Igarashi Junta、Iwakiri Shuichi、Kitada Takahito、Hayakawa Keisuke、Jinnai Butsurin、Otsuka Tomohiro、Fukami Shunsuke、Kobayashi Kensuke、Ohno Hideo
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 9

    • DOI

      10.1103/physrevb.107.094436

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Scalable fabrication of graphene nanoribbon quantum dot devices with stable orbital-level spacing2022

    • Author(s)
      Kato Toshiaki、Kitada Takahito、Seo Mizuki、Okita Wakana、Sato Naofumi、Shinozaki Motoya、Abe Takaya、Kumasaka Takeshi、Aizawa Takumi、Muto Yui、Kaneko Toshiro、Otsuka Tomohiro
    • Journal Title

      Communications Materials

      Volume: 3 Issue: 1

    • DOI

      10.1038/s43246-022-00326-3

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Semiconductor Qubits and New Materials2024

    • Author(s)
      Tomohiro Otsuka
    • Organizer
      UK-Japan-Swiss Workshop ‘Materials for Quantum Electronics’
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] GaN FETにおけるマイクロ波共鳴ピークの解析2024

    • Author(s)
      松村和真、阿部峰也、篠崎基矢、相澤拓海、熊坂武志、大塚朋廣
    • Organizer
      日本物理学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] High-frequency measurement in graphene nanostructures for quantum devices2023

    • Author(s)
      Tomoya Johmen, Motoya Shinozaki, Yoshihiro Fujiwara, Takumi Aizawa, and Tomohiro Otsuka
    • Organizer
      Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems, Superconducting SFQ VLSI Workshop, and International Workshop of Spin/Quantum Materials and Devices
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radio-frequency reflectometry measurement in bilayer graphene microdevices2023

    • Author(s)
      Tomoya Johmen, Motoya Shinozaki, Yoshihiro Fujiwara, Riku Tataka, Takumi Aizawa, Takeshi Kumasaka, and Tomohiro Otsuka
    • Organizer
      International Conference on Electronic Properties of Two-Dimensional Systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Semiconductor spin qubits and new materials2023

    • Author(s)
      Tomohiro Otsuka
    • Organizer
      Workshop: Emerging Platforms for Quantum Computing
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 高周波反射測定の高速PID制御による電荷センサのダイナミックレンジ改善2023

    • Author(s)
      篠﨑基矢、藤原義弘、松村和真、野呂康介、 田髙陸、佐藤彰一、熊坂武志、大塚朋廣
    • Organizer
      日本物理学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 短チャネルGaN FETにおける少数量子ドットの形成2023

    • Author(s)
      松村和真、阿部峰也、北田孝仁、熊坂武志、伊藤範和、田中岳利、中原健、大塚朋廣
    • Organizer
      日本物理学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Quantum dots in new materials for quantum devices2023

    • Author(s)
      Tomohiro Otsuka
    • Organizer
      International Workshop of Spin/Quantum Materials and Devices
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 二層グラフェン微小デバイスにおける高周波反射測定2022

    • Author(s)
      上面友也、篠崎基矢、熊坂武志、藤原義弘、田高陸、相澤拓海、大塚朋廣
    • Organizer
      日本物理学会
    • Related Report
      2022 Research-status Report
  • [Presentation] 高周波反射測定による量子ドットQCA状態電荷遷移の実時間観測2022

    • Author(s)
      相澤拓海、篠﨑基矢、藤原義弘、熊坂武、中島峻、Matthieu R. Delbecq、米田淳、武田健太、野入亮人、Arne Ludwig、Andreas D. Wieck、樽茶清悟、大塚朋廣
    • Organizer
      日本物理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Takumi Aizawa, Motoya Shinozaki, Yoshihiro Fujiwara, Takeshi Kumasaka, Wataru Izumida, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, and Tomohiro Otsuka2022

    • Author(s)
      Real-time measurement of QCA charge transition in quantum dots by rf-reflectometry
    • Organizer
      The 11th Workshop on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
    • Related Report
      2021 Research-status Report
  • [Presentation] Noise analysis of radio-frequency reflectometry for single spin and charge detection in quantum dots2021

    • Author(s)
      Tomohiro Otsuka, Motoya Shinozaki, Yui Muto, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
    • Organizer
      1st Online RIEC International Workshop on Spintronics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2021-07-13   Modified: 2025-01-30  

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