Reexamination of the feedback control on quantum states via weak measurements

Xing Xiao and Mang Feng

Phys. Rev. A 83, 054301 – Published 11 May 2011

Abstract

Although information gain and disturbance in quantum systems are always antagonistic in quantum theory, a recently proposed optimal feedback control system [A. M. Brańczyk, P. E. M. F. Mendonca, A. Gilchrist, A. C. Doherty, and S. D. Bartlett, Phys. Rev. A 75, 012329 (2007)] could reach a trade-off by using weak measurements in the case of pure dephasing noise. We reexamine this approach for stabilizing quantum states in the presence of different noise sources and with respect to different system states. We find that the approach is sensitive to the system state but, for some suitable states, it works well for all typical types of noise sources.

Received 10 March 2011

DOI:https://doi.org/10.1103/PhysRevA.83.054301

Authors & Affiliations

Xing Xiao^1,2 and Mang Feng^2,*

¹Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, College of Physics and Information Science, Hunan Normal University, Changsha 410081, China
²State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, and Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China

^*mangfeng@wipm.ac.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 83, Iss. 5 — May 2011

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review A

covering atomic, molecular, and optical physics and quantum information