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Performance analysis and approximation theory for quantum dynamical estimator

Research Project

Project/Area Number 16K21127
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Statistical science
Control engineering/System engineering
Research InstitutionKyoto University

Principal Investigator

Ohki Kentaro  京都大学, 情報学研究科, 助教 (40639233)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords平均場型量子フィルタ / 平均場型蓄電池制御 / 量子スムージング / 移動エントロピー / 量子フィルタリング / 近似フィルタ / 状態推定 / 量子情報 / 制御工学 / 量子統計
Outline of Final Research Achievements

In quantum information processing, the control of spin systems is essential. In particular, error correction requires measurement-based feedback control, and the quantum state must be properly estimated from the measurement outcomes. Besides, this needs real time processing, and cannot be done in practice if the spin system becomes large. Therefore, decentralized processing is also important.
In this study, we extend the concept of mean-field games, which are large-scale non-cooperative games in classical systems, to quantum systems and introduce a mean-field quantum filter to realize distributed processing. Although this application is limited to specific quantum systems, it can approximate very large dimensional problems to very low order problems.

Academic Significance and Societal Importance of the Research Achievements

古典系では,所望の制御目標を達成するために測定された信号を計算機を用いて自由に整形することが可能であり,計算量の工夫も多く知られている.一方,量子系の信号処理では,その次元の大きさが膨大になることから,古典系よりも計算量の工夫が必要であり,それは適切な近似問題として表すことができる.
本研究は,イジング模型と呼ばれる量子系に対して,そのフィードバック制御における状態推定の低次元近似問題を平均場近似で与えることで,次元が大きければ大きいほど近似精度がよくなる結果が得られた.これは量子制御の実装がより容易になったことを意味する.

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (15 results)

All 2020 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Nonclassical state generation for linear quantum systems via nonlinear feedback control2017

    • Author(s)
      Ohki Kentaro、Tsumura Koji、Takeuchi Reiji
    • Journal Title

      Journal of Physics B: Atomic, Molecular and Optical Physics

      Volume: 50 Issue: 12 Pages: 125503-125503

    • DOI

      10.1088/1361-6455/aa721c

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] An invitation to quantum filtering and smoothing theory based on two inner products2017

    • Author(s)
      Kentaro Ohki
    • Journal Title

      RIMS Kokyuroku

      Volume: 2018

    • Related Report
      2016 Research-status Report
    • Open Access
  • [Presentation] Mean-field type quantum filter for a quantum Ising type system2020

    • Author(s)
      Kentaro Ohki
    • Organizer
      21st IFAC World Congress
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Distributed control of stochastic battery systems via mean field game2019

    • Author(s)
      Nobuya Kamo, Kentaro Ohki
    • Organizer
      SICE Annual Conference 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 量子状態スムージング:再帰的手法への一考察2019

    • Author(s)
      大木健太郎
    • Organizer
      第7回 制御部門マルチシンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] 平均場ゲームを用いた大規模量子フィードバック制御にむけて2019

    • Author(s)
      大木健太郎
    • Organizer
      第62回自動制御連合講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] フィードバック制御による量子アニーリング計算精度の向上に向けて2019

    • Author(s)
      大木 健太郎
    • Organizer
      第6回 制御部門マルチシンポジウム (MSCS2019)
    • Related Report
      2018 Research-status Report
  • [Presentation] A study of minimax LEQG control with constant-constrained Renyi divergence2018

    • Author(s)
      Nobuya Kamo, Kentaro Ohki
    • Organizer
      The 50th ISCIE International Symposium on Stochastic Systems Theory and Its Applications (SSS '18)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Quantum smoother for open quantum systems driven by quantum jump-diffusion processes2018

    • Author(s)
      Kentaro Ohki
    • Organizer
      The 50th ISCIE International Symposium on Stochastic Systems Theory and Its Applications (SSS '18)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 確率ネットワーク化システムにおける移動エントロピーの解析とネットワーク推定問題への応用2018

    • Author(s)
      村上 正和, 大木 健太郎
    • Organizer
      第62回システム制御情報学会研究発表講演会 (SCI’18)
    • Related Report
      2018 Research-status Report
  • [Presentation] 量子系におけるネットワーク化制御とその応用2018

    • Author(s)
      大木 健太郎
    • Organizer
      第62回システム制御情報学会研究発表講演会 (SCI’18)
    • Related Report
      2018 Research-status Report
  • [Presentation] Quantum communication2018

    • Author(s)
      Kentaro Ohki
    • Organizer
      The SICE Annual Conference 2018 (SICE 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] ポワソン型観測過程に基づく量子スムージング2018

    • Author(s)
      大木健太郎
    • Organizer
      第5回計測自動制御部門マルチシンポジウム
    • Related Report
      2017 Research-status Report
  • [Presentation] An Improvement of convergence rate of exchange Monte Carlo method2017

    • Author(s)
      Kentaro Ohki
    • Organizer
      "量子人工脳を量子ネットワークでつなぐ高度知識社会基盤の実現" 量子情報技術ワークショップ
    • Place of Presentation
      JST東京本部別館(東京都千代田区)
    • Year and Date
      2017-03-27
    • Related Report
      2016 Research-status Report
  • [Presentation] 移動情報量を用いたネットワーク推定問題の検討2017

    • Author(s)
      村上 正和,大木 健太郎
    • Organizer
      第60回自動制御連合講演会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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