Design and realization of quantum feedback systems

2013 Fiscal Year Final Research Report

• Project/Area Number: 22560439
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Control engineering
• Research Institution: The University of Tokyo
• Principal Investigator: TSUMURA Koji 東京大学, 情報理工学(系)研究科, 准教授 (80241941)
• Co-Investigator(Kenkyū-buntansha): YONEZAWA Hidehiro 東京大学, 大学院工学系研究科, 講師 (50451802)
• Co-Investigator(Renkei-kenkyūsha): HARA Shinji 東京大学, 大学院情報理工学系研究科, 教授 (80134972) ; FURUSAWA Akira 東京大学, 大学院工学系研究科, 教授 (90332569) ; YAMAMOTO Naoki 慶応義塾大学, 理工学部, 講師 (40513289)
• Project Period (FY): 2010-04-01 – 2013-03-31
• Keywords: フィードバック制御 / 量子力学 / 量子フィルタ / 量子光学系 / 連続測定

Research Abstract

The main theme of this research is to design or realize quantum systems with optics systems for showing the effectiveness of the quantum filter theory or the quantum control theory. In particular, the actual objective is to clarify the indispensable property of systems for the quantum state estimations or generating and holding quantum entangled states based on the quantum filter theory and the feedback control theory. The results of this research is to specify a quantum optics system, a combined system composed of a quantum optics system and a spin system, and the corresponding control strategies. We also succeed to derive the corresponding quantum filter equations. With this equations, we can show the effectiveness of the quantum state estimation by the actual experiments or that the feedback systems can generate the entangled states by numerical simulations. Moreover, we can also prove the controllability of a quantum feedback system.

Research Products

• [Journal Article] Quantum-Enhanced Optical-Phase Tracking (2012)
  • Author(s): H. Yonezawa, D. Nakane, T. A. Wheatley, K. Iwasawa, S. Takeda, H. Arao, K. Ohki, K. Tsumura, D. W. Berry, T. C. Ralph, H. M. Wiseman, E. H. Huntington, A. Furusawa
  • Journal Title: Science Volume: Vol. 337 Pages: 1514-1517
  • Peer Reviewed
• [Journal Article] Local state transition of feedback controlled quantum systems with imperfect detector efficiency : Part II : Accessibility analysis for quantum systems (2010)
  • Author(s): T.Sasaki, S. Hara, K. Tsumura
  • Journal Title: SICE Journal of Control, Measurement, and System Integration Volume: vol. 3, no. 6 Pages: 417-423
  • Peer Reviewed
• [Journal Article] Local state transition of feedback controlled quantum systems with imperfect detector efficiency : Part I : Differential geometric analysis for dynamical systems with matrix-valued states (2010)
  • Author(s): T.Sasaki, S. Hara, K. Tsumura
  • Journal Title: SICE Journal of Control, Measurement, and System Integration Volume: vol. 3, no. 6 Pages: 409-416
  • Peer Reviewed
• [Presentation] 多スピンqubitシステムの可制御性について:GHZ状態生成に向けて (2013)
  • Author(s): 平野正浩,吉永悠馬,津村幸治
  • Organizer: 第13回計測自動制御学会制御部門大会
  • Place of Presentation: アクロス福岡
  • Year and Date: 20130305-08
• [Presentation] 多量子ビット系のフィードバック制御に向けて (2012)
  • Author(s): 津村幸治
  • Organizer: 第56回システム制御情報学会研究発表講演会
  • Place of Presentation: 京都テルサ
  • Year and Date: 20120521-23
  • Invited
• [Presentation] Global Stabilization of Quantum Spin Systems via Discrete Time Feedback Control (2010)
  • Author(s): D. Matsuna, K. Tsumura
  • Organizer: the 49th IEEE Conference of Decision and Control
  • Place of Presentation: Atlanta
  • Year and Date: 20101215-17
• [Presentation] Accessibility Analysis for Controlled Quantum Systems under Continuous Quantum Measurement (2010)
  • Author(s): T. Sasaki, S. Hara, K. Tsumura
  • Organizer: Proc. 19th IEEE International Conference on Control Applications
  • Place of Presentation: Yokohama
  • Year and Date: 20100908-10
• [Presentation] Design of Observation for Multi-qubit Preparation based on Equilibrium Point Analysis (2010)
  • Author(s): D. Matsuna, K. Tsumura
  • Organizer: Proceedings of SICE Annual Conference 2010
  • Place of Presentation: Taipei
  • Year and Date: 20100818-21