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arXiv 0705.2472quant-ph
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纠缠相干态的非马尔可夫退相干动力学

Non-Markovian decoherence dynamics of entangled coherent states

Jun-Hong An, Mang Feng, Wei-Min Zhang

摘要:

我们在微观上模拟了真空涨落影响下纠缠相干态的退相干动力学。利用相干态表象中的Feynman-Vernon影响泛函理论,导出了反映环境记忆效应的系数随时间变化的精确主方程.在马尔可夫近似下,我们的主方程恢复了量子光学中广泛使用的林德布拉德方程。然后,我们研究了噪声下的纠缠相干态的量子信道的非马尔可夫纠缠动力学。与马尔可夫极限下的结果相比,非马尔可夫效应增强了初始纠缠相干态的退纠缠。我们的分析还表明,纠缠相干态的退相干行为敏感地依赖于纠缠相干态的对称性以及系统与环境之间的相互作用。

英文摘要:

We microscopically model the decoherence dynamics of entangled coherent states under the influence of vacuum fluctuation. We derive an exact master equation with time-dependent coefficients reflecting the memory effect of the environment, by using the Feynman-Vernon influence functional theory in the coherent-state representation. Under the Markovian approximation, our master equation recovers the widely used Lindblad equation in quantum optics. We then investigate the non-Markovian entanglement dynamics of the quantum channel in terms of the entangled coherent states under noise. Compared with the results in Markovian limit, it shows that the non-Markovian effect enhances the disentanglement to the initially entangled coherent state. Our analysis also shows that the decoherence behaviors of the entangled coherent states depend sensitively on the symmetrical properties of the entangled coherent states as well as the interactions between the system and the environment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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