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Few-spin physcis in lateral quantum dots in near-zero magnetic field regime

Research Project

Project/Area Number 21K13867
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionOsaka University

Principal Investigator

Fujita Takafumi  大阪大学, 産業科学研究所, 准教授 (00809642)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords量子ドット / 量子情報処理 / 半導体 / スピン制御 / 光励起 / 単一電子スピン / 非ドープ型量子井戸 / GaAs / 面内pin接合 / スピン軌道相互作用 / 超微細相互作用
Outline of Research at the Start

微細金属電極を配した形の半導体スピンデバイスは、量子情報の集積化に関連して注目されている。単一スピン磁化の測定は、現状では電気的な測定に限られ、前段階として熱揺らぎより大きいエネルギー的分離を用意するために、テスラ級の磁場あるいは極低温を必要としている。本研究では、熱揺らぎを下回るエネルギー分離下でのスピン測定について研究し、低磁場下でのスピン緩和過程や、光学的測定手法の可能性について明らかにしていく。

Outline of Final Research Achievements

In this research project, we have developed a new device that confines single electrons and single holes. This allows us to control electrons and holes at very close distances, leading to the realization of new quantum dot devices. We aim to initialize spins by confining optically excited spins, and have conducted electromagnetic field simulations of the device structures while establishing high-precision electrode fabrication techniques. Additionally, we are aiming for spin manipulation at low magnetic fields and have demonstrated each foundational technology. These achievements are expected to lead to the realization of the aimed applications.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、学術的には新しい量子ドットデバイスを実現し、量子情報処理や通信の分野での応用が期待されます。従来、半導体中の量子情報キャリアは電子か正孔の片方のみの制御でしたが、本研究では両方のキャリアの制御や光との結合を目指し、磁場不要で高温での動作を目指しています。これにより、汎用性の高い複合的なデバイスの開発が促進され、情報技術やセキュリティー、ナノスケールのセンシングなど社旗への貢献が期待されます。

Report

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

    (17 results)

All 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 6 results)

  • [Int'l Joint Research] Ruhr Universitat Bochum(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ルール大学ボーフム(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] National Research Council Canada(カナダ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Noise-robust classification of single-shot electron spin readouts using a deep neural network2021

    • Author(s)
      Y. Matsumoto, T. Fujita, A. Ludwig, A. D. Wieck, K. Komatani and A. Oiwa
    • Journal Title

      npj Quantum Information

      Volume: 7 Issue: 1 Pages: 136-136

    • DOI

      10.1038/s41534-021-00470-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Distinguishing persistent effects in an undoped GaAs/AlGaAs quantum well by top-gate-dependent illumination2021

    • Author(s)
      T. Fujita, R. Hayashi, M. Kohda, J. Ritzmann, A. Ludwig, J. Nitta, A. D. Wieck, and A. Oiwa
    • Journal Title

      Journal of Applied Physics

      Volume: 129 Issue: 23 Pages: 234301-234301

    • DOI

      10.1063/5.0047558

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 多重量子ドットにおける高速高忠実度スピン操作2023

    • Author(s)
      松本雄太, 藤田高史, X.Liu, A.Ludwig, A.D.Wieck, 小池啓介, 三好健文, 大岩顕
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] スピン量子ビットのための量子ドット多重化とスピン伝送2023

    • Author(s)
      藤田 高史
    • Organizer
      Spin-RNJ Symposium 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 量子ドット列中のスピン輸送を応用した量子情報読み出し・操作・伝送2023

    • Author(s)
      藤田 高史
    • Organizer
      スピン学際年次報告会
    • Related Report
      2022 Research-status Report
  • [Presentation] 量子ドット列を介したスピン量子ビットの断熱量子状態転送2023

    • Author(s)
      湯田 秀明、藤田 高史、大岩 顕
    • Organizer
      第70回 応用物理学会 春季学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] 高周波のパルス変調を用いた電子スピン量子ビットの断熱反転操作高速化2023

    • Author(s)
      Xial-Fei Liu、松本雄太、藤田 高史、木山治樹、J.Ritzmann A、A.Ludwig A、A.D.Wieck A、大岩顕
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Fast single-spin qubit operation and its coherence time enhanced by feedback control2022

    • Author(s)
      Y. Matsumoto, T. Fujita, A. Ludwig, A.D. Wieck, K.Koike,T.Miyoshi, and A. Oiwa
    • Organizer
      International Conference on the Physics of Semiconductors 30th
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fast single-spin qubit operation and its coherence time enhanced by feedback control2022

    • Author(s)
      Y. Matsumoto, T. Fujita, A. Ludwig, A.D. Wieck, K.Koike,T.Miyoshi, and A. Oiwa
    • Organizer
      Spin qubit 5
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Coherently coupling single-spins in semiconductor quantum dots2022

    • Author(s)
      T. Fujita
    • Organizer
      11th imec Handai International Symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Optical emission from a lateral p-i-n junction formed in an un doped GaAs/AlGaAs quantum well2021

    • Author(s)
      Takafumi Fujita, Satoshi Yanagidani, Genki Fukuda Julian Ritzmann, Arne Ludwig, Akira Oiwa
    • Organizer
      Joint Conference: 24th International Conference on Electronic Properties of Two-Dimensional Systems 20th International Conference on Modulated Semiconductor Structures
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Illumination Effects on Gate-defined GaAs Quantum Dots in an Undoped Quantum Well2021

    • Author(s)
      G. Fukuda, R. Hayashi, T. Fujita, M. Kohda, J. Ritzmann, A. Ludwig, J. Nitta, A. D Wieck, A. Oiwa
    • Organizer
      Joint Conference: 24th International Conference on Electronic Properties of Two-Dimensional Systems 20th International Conference on Modulated Semiconductor Structures
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fast singlet-triplet readout using a deep neural network2021

    • Author(s)
      Y. Matsumoto, T. Fujita, A. Ludwig, A. D. Wieck, and A. Oiwa
    • Organizer
      Joint Conference: 24th International Conference on Electronic Properties of Two-Dimensional Systems 20th International Conference on Modulated Semiconductor Structures
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 深層学習手法を用いた量子ドット内電子スピン状態の高精度検出2021

    • Author(s)
      松本雄太, 藤田高史, Arne Ludwig, Andreas D. Wieck, 大岩顕
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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