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

• Published in: Communications in theoretical physics Vol. 55; no. 2; pp. 232 - 238
• Main Author: 向少华 宋克慧 文伟 施振刚
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.02.2011
• Subjects: Compressing; Dynamic tests; Dynamics; Entanglement; Evolution; Holes; Mathematical analysis; Mathematical models; 压缩参数; 双模压缩; 状态模型; 真空环境; 量子纠缠; 非局域性
• ISSN: 0253-6102
• DOI: 10.1088/0253-6102/55/2/09

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.