Quantum Entanglement and Nonlocality Properties of Two-Mode Squeezed Thermal States in a Common-Reservoir Model  被引量:4

Quantum Entanglement and Nonlocality Properties of Two-Mode Squeezed Thermal States in a Common-Reservoir Model

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作  者:向少华 宋克慧 文伟 施振刚 

机构地区:[1]Department of Physics and Information Engineering, Huaihua University

出  处:《Communications in Theoretical Physics》2011年第2期232-238,共7页理论物理通讯(英文版)

基  金:Supported by Hunan Provincial Natural Science Foundation of China under Grant No.10JJ6010;the Key Project Foundation of Hunan Provincial Education Department of China under Grant No.10A095

摘  要:We study a system consisting of two identical non-interacting single-mode cavity fields coupled to a common vacuum environment and provide general, explicit, and exact solutions to its master equation by means of the characteristic function method. We analyze the entanglement dynamics of two-mode squeezed thermal state in this model and show that its entanglement dynamics is strongly determined by the two-mode squeezing parameter and the purity. In particular, we find that two-mode squeezed thermal state with the squeezing parameter r ≤ -(1/2) In √u is extremely fragile and almost does not survive in a common vacuum environment. We investigate the time evolution of nonlocality for two-mode squeezed thermal state in such an environment. It is found that the evolved state loses its nonlocality in the beginning of the evolution, but after a time, the revival of nonlocality can occur.

关 键 词:keytwo-mode squeezed thermal state ENTANGLEMENT Bell's inequality environmental noise 

分 类 号:O413.1[理学—理论物理] TS262.2[理学—物理]

 

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