Nonclassicality of the photon addition-then-subtraction coherent state and its decoherence in the photon-loss channel
Nonclassicality of the photon addition-then-subtraction coherent state and its decoherence in the photon-loss channel
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DOI：
10.1364/josab.28.001964
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发表时间：
2011-08
影响因子：
1.9
通讯作者：
Zhen Wang;Hongchun Yuan;H. Fan
中科院分区：
文献类型：
--
作者：
Zhen Wang;Hongchun Yuan;H. Fan
本文提出了先向相干态中加入多光子，再从相干态中减去多光子的光子加减相干态（PASCS）。利用算子的有序积内积分技术，导出了PASCS的归一化常数、光子数分布、曼德尔Q参数、P函数、Q函数和Wigner函数的解析表达式。推导了PASCS与初始相干态的保真度，并讨论了其非经典性。此外，分析推导了光场的时间演化，并研究了PASCS在光子损耗通道中的退相干特性。
In this paper the photon addition-then-subtraction coherent state (PASCS) is put forward by first adding multiphotons to and then subtracting multiphotons from the coherent state. By taking advantage of the technique of integration within an ordered product of operators, the analytical expressions of the normalization constant, photon-number distribution, Mandel’s Q parameter, the P function, the Q function, and the Wigner function (WF) of the PASCS are derived. The fidelity between the PASCS and the initial coherent state is also deduced and its nonclassicality discussed. In addition, the time evolution of the WF is derived analytically and the decoherence of the PASCS in the photon-loss channel is studied.