Entanglement dynamics and quasiprobability distribution for the degenerate Raman process
Entanglement dynamics and quasiprobability distribution for the degenerate Raman process
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简并拉曼过程的纠缠动力学和准概率分布
DOI：
10.1016/j.ijleo.2013.09.055
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发表时间：
2014-03
期刊：
影响因子：
3.1
通讯作者：
Muhammad Ashfaq Ahmad
中科院分区：
文献类型：
--
作者：
Qinghong Liao;Ye Liu;Qiurong Yan;Muhammad Ashfaq Ahmad
本文考虑原子与单模腔场相互作用的简并拉曼过程，该过程涉及原子的两个简并里德堡能级。研究了原子相干性对原子的von Neumann熵和原子反转的影响。结果表明，原子的相干性降低了原子与光场的纠缠量。研究还发现，崩塌和回复时间与原子的相干性无关，而回复的幅度对原子的相干性很敏感。此外，还研究了光场的Q函数和熵压缩。得到了一些新的结论。
In this paper, we consider the model which consists of a degenerate Raman process involving two degenerate Rydberg energy levels of an atom interacting with a single-mode cavity field. The influence of the atomic coherence on the von Neumann entropy of the atom and the atomic inversion is investigated. It is shown that the atomic coherence decreases the amount of atom-field entanglement. It is also found that the collapse and revival times are independent of the atomic coherence, while the amplitude of the revivals is sensitive to this coherence. Moreover, theQfunction and the entropy squeezing of the field are examined. Some new conclusions can be obtained.