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Ohki, Kentaro

Graduate School of Informatics, Department of Applied Mathematics and Physics Assistant Professor

Ohki, Kentaro
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    Last Updated :2022/05/14

    Basic Information

    Faculty

    • 工学部 工学部

    Professional Memberships

    • The Institute of Systems, Control and Information Engineers
    • The Physical Society of Japan
    • IEEE
    • The Society of Instrument and Control Engineers

    Academic Degree

    • Master of Information Science and Technology(The University of Tokyo)
    • Ph.D.(Information Science and Technology)(The University of Tokyo)

    Language of Instruction

    • English

    ID,URL

    researchmap URL

    list
      Last Updated :2022/05/14

      Research

      Research Topics, Overview of the research

      • Research Topics

        Robust filtering and control theory for stochastic and open quantum systems
      • Overview of the research

        My research interests are in estimation and control of stochastic dynamical systems, in particular, quantum dynamical systems, and their applications to quantum information technology. My research interests are mathematics related to quantum and probability theory, which includes stochastic calculus, quantum stochastic calculus, classical and quantum statistics, the theory of operator algebras, and optimization theory, and also applications to implement quantum information technology (e.g., quantum computation and quantum communication).

      Research Areas

      • Natural sciences, Applied mathematics and statistics, Quantum statistics, quantum information
      • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Control and systems engineering, Quantum control, filtering theory, stochastic control theory, adaptive control

      Papers

      • Mean-field type quantum filter for a quantum Ising type system
        Kentaro Ohki
        IFAC-PapersOnLine, 2020, Peer-reviewed, Lead author, Corresponding author
      • An event-based quantum error correction via measurement-based feedback control
        Shuto Yamada; Kentaro Ohki; Kenji Kashima
        SICE Annual Conference, Sep. 2019, Peer-reviewed
      • A study of minimax LEQG control with constant-constrained Renyi divergence
        Nobuya Kamo; Kentaro Ohki
        The 50th ISCIE International Symposium on Stochastic Systems Theory and Its Applications, Nov. 2018, Peer-reviewed
      • Quantum smoother for open quantum systems driven by quantum jump-diffusion processes
        Kentaro Ohki
        The 50th ISCIE International Symposium on Stochastic Systems Theory and Its Applications, Nov. 2018, Peer-reviewed
      • Analyzing the effects of transmission line fault on the stochastic model predictive controlled IEEE 30-bus system with uncertain environment
        Kentaro Ohki; Takuya Kakehashi; Hideharu Sugihara; Kenji Kashima; Yoshito Ohta
        2017 IEEE Conference on Control Technology and Applications (CCTA), Aug. 2017, Peer-reviewed
      • Nonclassical state generation for linear quantum systems via nonlinear feedback control
        Kentaro Ohki; Koji Tsumura; Reiji Takeuchi
        JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Jun. 2017, Peer-reviewed
      • Power generation scheduling with transmission line thermal constraints: A case study
        Yuya Tomisawa; Kentaro Ohki; Hideharu Sugihara; Kenji Kashima; Yoshito Ohta
        2nd SICE International Symposium on Control Systems 2016, Mar. 2016, Peer-reviewed
      • Exploitation of uncertain weather forecast data in power network management
        Y. Tomisawa; K. Ohki; H. Sugihara; K. Kashima; Y. Ohta
        IFAC PAPERSONLINE, 2016, Peer-reviewed
      • A smoothing theory for open quantum systems: The least mean square approach
        Kentaro Ohki
        Proceedings of the IEEE Conference on Decision and Control, 08 Feb. 2015, Peer-reviewed
      • Quantum-Enhanced Optical-Phase Tracking
        Hidehiro Yonezawa; Daisuke Nakane; Trevor A. Wheatley; Kohjiro Iwasawa; Shuntaro Takeda; Hajime Arao; Kentaro Ohki; Koji Tsumura; Dominic W. Berry; Timothy C. Ralph; Howard M. Wiseman; Elanor H. Huntington; Akira Furusawa
        SCIENCE, Sep. 2012, Peer-reviewed
      • On quantum-classical equivalence for linear systems control problems and its application to quantum entanglement assignment
        Kentaro Ohki; Shinji Hara; Naoki Yamamoto
        Proceedings of the IEEE Conference on Decision and Control, 2011, Peer-reviewed
      • Robust quantum Kalman filtering under the phase uncertainty of the probe-laser
        Sanae Iida; Kentaro Ohki; Naoki Yamamoto
        Proceedings of the IEEE International Symposium on Computer-Aided Control System Design, 2010, Peer-reviewed
      • A proposal of adaptive parameter tuning for robust stabilizing control of N–level quantum angular momentum systems
        Shoju Enami; Kentaro Ohki
        2021 60th IEEE Conference on Decision and Control (CDC), 14 Dec. 2021, Peer-reviewed, Corresponding author
      • Comparison of estimation error between two different low-rank Kalman-Bucy filters
        Shuto Yamada; Kentaro Ohki
        2021 60th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE), Sep. 2021, Peer-reviewed, Corresponding author
      • Convergence analysis of adaptive tuning parameter for robust stabilizing control of N-level quantum systems
        Shoju Enami; Kentaro Ohki
        2021 60th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE), Sep. 2021, Peer-reviewed, Corresponding author

      Misc.

      • N準位量子系のロバスト制御のための適応パラメータ推定
        江波祥樹; 大木健太郎
        第65回システム制御情報学会研究発表会(SCI’21)予稿集, May 2021
      • 散逸ダイナミクスを用いた量子復号
        下村光彦; 大木健太郎; 津村幸治
        第8回 制御部門マルチシンポジウム, Mar. 2021
      • パケットロスのあるシステムに対するイベント駆動型推定と通信量削減手法の提案
        梶田健ノ介; 大木健太郎
        第63回自動制御連合講演会, Nov. 2020
      • 量子状態スムージング:再帰的手法への一考察
        大木健太郎
        第7回制御部門マルチシンポジウム予稿集, Mar. 2020
      • 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
        大木健太郎
        第62回自動制御連合講演会予稿集, Nov. 2019
      • イベント駆動型測定に基づく量子誤り訂正
        山田脩人; 大木健太郎; 加嶋健司
        第63回システム制御情報学会研究発表会(SCI’19)予稿集, May 2019
      • フィードバック制御によるロバスト量子アニーリング計算精度の向上に向けて
        大木健太郎
        第6回計測自動制御部門マルチシンポジウム予稿集, Mar. 2019
      • 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
        村上正和; 大木 健太郎
        第62回システム制御情報学会研究発表講演会, May 2018
      • 量子系におけるネットワーク化制御とその応用
        大木 健太郎
        第62回システム制御情報学会研究発表講演会, May 2018
      • グラディエント・フローを用いた正四面体の展開図作成法の検討
        加茂暢也; 大木 健太郎
        第62回システム制御情報学会研究発表講演会, May 2018
      • 移動情報量を用いたネットワーク推定問題の検討
        村上正和; 大木 健太郎
        第60回 自動制御連合講演会, Nov. 2017
      • Exploitation of uncertain weather forecast data in transmission capacity management of the IEEE 30-bus system
        Takuya Kakehashi; Kentaro Ohki; Eiji Sugihara
        The 4th Multi-Symposium on Control Systems, Mar. 2017
      • An invitation to quantum filtering and smoothing theory based on two inner products
        Kentaro Ohki
        RIMS Kokuroku, Jan. 2017
      • Optimal Power Generation scheduling with transmission line thermal constraints by model predictive control
        Yuya Tomisawa; Kentaro Ohki; Kenji Kashima; Yoshito Ohta
        第60回システム制御情報学会研究発表講演会, May 2016
      • Power generation scheduring with uncertain transmission line temperature constraints by stochastic model predictive control scheme
        Yuya Tomisawa; Kentaro Ohki; Hideharu Sugihara; Kenji Kashima; Yoshito Ohta
        SICE International Symposium on Control Systems 2016, Mar. 2016, Peer-reviewed
      • Flow of information between bipartite linear quantum systems and quantum entanglement
        Yusuke Tanbo; Kentaro Ohki
        第59回システム制御情報学会研究発表講演会, May 2015
      • 確率的な現象とその多様な捉え方
        大木 健太郎; 加嶋 健司
        計測と制御, Apr. 2013, Peer-reviewed, Invited

      Presentations

      • Convergence analysis of adaptive tuning parameter for robust stabilizing control of N-level quantum systems
        Shoju Enami; Kentaro Ohki
        SICE Annual Conference 2021, 08 Sep. 2021
      • N準位量子系のロバスト制御のための適応パラメータ推定
        江波祥樹; 大木健太郎
        第65回システム制御情報学会研究発表会(SCI’21), 28 May 2021
      • 散逸ダイナミクスを用いた量子復号
        下村光彦; 大木健太郎; 津村幸治
        第8回 制御部門マルチシンポジウム, Mar. 2021
      • パケットロスのあるシステムに対するイベント駆動型推定と通信量削減手法の提案
        梶田健ノ介; 大木健太郎
        第63回自動制御連合講演会, 22 Nov. 2020
      • On a New Low-Rank Kalman-Bucy Filter and Its Convergence Property
        Shuto Yamada; Kentaro Ohki
        The 52nd ISCIE International Symposium on Stochastic Systems Theory and Its Applications (SSS '20), 30 Oct. 2020
      • Mean-field type quantum filter for a quantum Ising type system
        Kentaro Ohki
        the 1st Virtual IFAC World Congress, 12 Jul. 2020
      • 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
        大木 健太郎
        第62回自動制御連合講演会, 08 Nov. 2019
      • Distributed Control of Stochastic Battery Systems Via Mean Field Game
        Nobuya Kamo; Kentaro Ohki
        SICE 2019, 11 Sep. 2019
      • An Event-Based Quantum Error Correction Via Measurement-Based Feedback Control
        Shuto Yamada; Kentaro Ohki; Kenji Kashima
        SICE 2019, 11 Sep. 2019, Invited
      • イベント駆動型測定に基づく量子誤り訂正:1補助ビットを用いたアプローチ
        山田 脩人; 大木 健太郎; 加嶋 健司
        第63回システム制御情報学会研究発表講演会, 24 May 2019
      • 量子システム制御理論の面白さと難しさ
        大木 健太郎
        真なるダイナミクスの 追求による 次世代システム制御理論 調査研究委員会次世代システム制御理論への挑戦, 20 Apr. 2019, Invited
      • 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
        大木 健太郎
        第6回計測自動制御学会制御部門マルチシンポジウム, 09 Mar. 2019
      • Quantum communication
        Kentaro Ohki
        SICE Annual Conference, 11 Sep. 2018, Invited
      • A convergence rate analysis of the continuous time replica exchange method
        Kentaro Ohki; Masayuki Ohzeki
        The 2015 Autumn Meeting, The Physical Society of Japan, 17 Sep. 2015
      • N準位量子系の適応ロバスト制御における可到達性解析
        江波祥樹; 大木健太郎
        第9回 制御部門マルチシンポジウム, 10 Mar. 2022
      • A proposal of adaptive parameter tuning for robust stabilizing control of N-level quantum angular momentum systems
        Shoju Enami; Kentaro Ohki
        The 60th Conference on Decision and Control (CDC2021), 14 Dec. 2021
      • 移動エントロピーによるダイナミカルシステムのモデル次数選択
        渡辺 陵真; 大木 健太郎
        第64回自動制御連合講演会, 14 Nov. 2021
      • N準位量子系の適応ロバスト制御のための適応ゲイン設計の考察
        江波祥樹; 大木健太郎
        第64回自動制御連合講演会, 13 Nov. 2021
      • On Recursive Quantum State Smoothing
        Kentaro Ohki
        The 53rd ISCIE International Symposium on Stochastic Systems Theory and Its Applications (SSS’21), 30 Oct. 2021, Invited
      • Comparison of Estimation Error between Two Different Low-Rank Kalman-Bucy Filters
        Shuto Yamada; Kentaro Ohki
        SICE Annual Conference 2021, 08 Sep. 2021

      Awards

      • 2011
        The Society of Instrument and Control Engineers, 学術奨励賞・研究奨励賞

      External funds: Kakenhi

      • 融合型AIに基づくインテリアの推薦のためのユーザー嗜好感性モデルの構築
        Grant-in-Aid for Scientific Research (C)
        Basic Section 61060:Kansei informatics-related
        Doshisha University
        小野 景子
        From 01 Apr. 2021, To 31 Mar. 2025, Granted
        インテリア推薦;感性;人工知能;重要ルール抽出
      • Development of theory and technology for quantum error correction based on quantum control theory
        Grant-in-Aid for Scientific Research (B)
        Basic Section 21040:Control and system engineering-related
        The University of Tokyo
        津村 幸治
        From 01 Apr. 2020, To 31 Mar. 2023, Granted
        制御理論;量子誤り訂正;量子情報理論;量子統計;量子計算理論
      • 量子情報量による不確かさの特徴づけと量子系におけるロバスト制御理論の構築
        Grant-in-Aid for Scientific Research (C)
        Basic Section 12040:Applied mathematics and statistics-related
        Kyoto University
        大木 健太郎
        From 01 Apr. 2019, To 31 Mar. 2023, Granted
        低次元化フィルタ;オンライン学習;ロバスト適応制御;量子ビット制御;量子スムージング;ロバスト制御;量子制御
      • Performance analysis and approximation theory for quantum dynamical estimator
        Grant-in-Aid for Young Scientists (B)
        Kyoto University
        Kentaro Ohki
        From 01 Apr. 2016, To 31 Mar. 2019, Project Closed
        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
      • Fusion of Control/Quantum/Information Theories for Quantum Control Technology
        Grant-in-Aid for Scientific Research (B)
        The University of Tokyo
        Koji Tsumura
        From 01 Apr. 2016, To 31 Mar. 2019, Project Closed
        制御工学;量子制御;量子フィルタリング理論;量子統計;量子計算;量子アニーリング;量子スムージング
      • Control systems that utilize interaction with environmental fluctuation
        Grant-in-Aid for Scientific Research (B)
        Kyoto University
        Kenji Kashima
        From 01 Apr. 2014, To 31 Mar. 2018, Project Closed
        制御工学;情報通信工学;薬学;機械学習;確率;確率論
      • A study of networked quantum/classical control via quantum channels
        Grant-in-Aid for Young Scientists (B)
        Kyoto University
        Kentaro Ohki
        From 01 Apr. 2013, To 31 Mar. 2016, Project Closed
        量子ネットワーク;量子スムージング;量子推定理論;スムージング理論;量子状態推定;量子通信;ネットワーク化制御;量子フィードバック制御
      • Optical non-Gaussian state generation via quantum feedback control
        Grant-in-Aid for Scientific Research (B)
        The University of Tokyo
        Koji Tsumura
        From 01 Apr. 2013, To 31 Mar. 2016, Project Closed
        制御理論;量子光学;数理物理;量子工学
      list
        Last Updated :2022/05/14

        Education

        Teaching subject(s)

        • From Apr. 2013, To Mar. 2014
          Seminar on Applied Mathematics and Physics
          Fall, 工学部
        • From Apr. 2013, To Mar. 2014
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2014, To Mar. 2015
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2015, To Mar. 2016
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2015, To Mar. 2016
          Seminar on Applied Mathematics and Physics
          Fall, 工学部
        • From Apr. 2016, To Mar. 2017
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2016, To Mar. 2017
          Seminar on Applied Mathematics and Physics
          Fall, 工学部
        • From Apr. 2017, To Mar. 2018
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2017, To Mar. 2018
          Seminar on Applied Mathematics and Physics
          Fall, 工学部
        • From Apr. 2018, To Mar. 2019
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2018, To Mar. 2019
          Seminar on Applied Mathematics and Physics
          Fall, 工学部
        • From Apr. 2019, To Mar. 2020
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2019, To Mar. 2020
          Seminar on Applied Mathematics and Physics
          Fall, 工学部
        • From Apr. 2020, To Mar. 2021
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2020, To Mar. 2021
          System Analysis Laboratory
          Fall, 工学部
        • From Apr. 2021, To Mar. 2022
          System Analysis Laboratory
          Spring, 工学部
        • From Apr. 2021, To Mar. 2022
          System Analysis Laboratory
          Spring, 工学部

        Student achievements: Awards

        • 第60回システム制御情報学会 奨励賞
          丹保 裕介, システム制御情報学会, 26 May 2016
        • 第60回自動制御連合講演会 優秀発表賞
          村上正和, 計測自動制御学会, 12 Nov. 2017
        list
          Last Updated :2022/05/14

          Administration

          Faculty management (title, position)

          • From 01 Apr. 2015, To 31 Mar. 2016
            情報セキュリティWG委員会委員
          • From 01 Apr. 2015, To 31 Mar. 2016
            システム運用WG委員会委員
          • From 01 Apr. 2012, To 31 Mar. 2013
            図書WG委員
          • From 01 Apr. 2012, To 31 Mar. 2013
            図書WG委員(兼任 数理コース)
          • From 01 Apr. 2013, To 31 Mar. 2014
            図書WG委員
          • From 01 Apr. 2013, To 31 Mar. 2014
            図書WG委員(兼任 数理コース)
          • From 01 Apr. 2015, To 31 Mar. 2016
            情報セキュリティWG委員
          • From 01 Apr. 2015, To 31 Mar. 2016
            システム運用WG委員
          • From 01 Apr. 2018, To 31 Mar. 2019
            評価WG委員
          • From 01 Apr. 2019, To 31 Mar. 2020
            広報WG委員

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