Partial entropy change and entanglement in the mixed state for a Jaynes–Cummings model with Kerr medium
Partial entropy change and entanglement in the mixed state for a Jaynes–Cummings model with Kerr medium
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DOI：
10.1088/1674-1056/19/2/024210
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发表时间：
2010-02
影响因子：
1.7
通讯作者：
张玉青;谭磊;朱中华;熊祖周;刘利伟
中科院分区：
文献类型：
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作者：
张玉青;谭磊;朱中华;熊祖周;刘利伟
利用代数动力学方法，研究了原子-光场混合态二体系统在克尔介质腔中的部分熵变和纠缠。研究了不同非线性强度的影响。研究发现，克尔非线性效应可以降低两个子系统的部分熵变和纠缠度的涨落幅度，并影响它们的周期演化。同时，增加克尔非线性强度可以将部分熵变的反相关行为转变为正相关行为。此外，纠缠很大程度上取决于温度。当温度或非线性强度增加到一定值时，纠缠可以得到很大的抑制。
By using the algebraic dynamical approach, an atom-field bipartite system in mixed state is employed to investigate the partial entropy change and the entanglement in a cavity filled with Kerr medium. The effects of different nonlinear intensities are studied. One can find that the Kerr nonlinearity can reduce the fluctuation amplitudes of the partial entropy changes and the entanglement of the two subsystems, and also influence their periodic evolution. Meanwhile, increasing the Kerr nonlinear strength can convert the anti-correlated behaviour of the partial entropy change to the positively correlated behaviour. Furthermore, the entanglement greatly depends on the temperature. When the temperature or the nonlinear intensity increases to a certain value, the entanglement can be suppressed greatly.