Protecting quantum states from decoherence of finite temperature using weak measurement

Shu-Chao Wang, Zong-Wen Yu, Wen-Jie Zou, and Xiang-Bin Wang

Phys. Rev. A 89, 022318 – Published 13 February 2014

Abstract

Exposed in the nonzero temperature environment, a quantum system can both lose and gain excitations by interacting with the environment. In this work, we show how to optimally protect quantum states and quantum entanglement in such a situation based on measurement reversal from weak measurement. In particular, we present explicit formulas of protection. We find that this scheme can circumvent the entanglement sudden death in certain conditions.

Received 12 September 2013

DOI:https://doi.org/10.1103/PhysRevA.89.022318

Authors & Affiliations

Shu-Chao Wang^1,2, Zong-Wen Yu³, Wen-Jie Zou^1,2, and Xiang-Bin Wang^1,2,4,*

¹State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University,Beijing 100084, People's Republic of China
²Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China,Hefei, Anhui 230026, China
³Data Communication Science and Technology Research Institute, Beijing 100191, China
⁴Shandong Academy of Information and Communication Technology, Jinan 250101, People's Republic of China

^*xbwang@mail.tsinghua.edu.cn

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Vol. 89, Iss. 2 — February 2014

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