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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
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