Nonclassical thermal-state superpositions: Analytical evolution law and decoherence behavior
Nonclassical thermal-state superpositions: Analytical evolution law and decoherence behavior
复制标题
DOI：
10.1016/j.optcom.2017.11.005
复制
发表时间：
2018-03
影响因子：
2.4
通讯作者：
X. Meng;H. Goan;Ji-suo Wang;Ran Zhang
中科院分区：
文献类型：
--
作者：
X. Meng;H. Goan;Ji-suo Wang;Ran Zhang
利用玻色子算符的正积内的积分技术，我们给出了热态叠加的正积表示，并研究了它们的非经典性质，如正交压缩、亚泊松分布和Wigner函数的部分负性.在振幅衰减模型下，通过相空间中Wigner函数的概率分布和负体积的变化，分析和数值研究了它们的演化规律和退相干特性.结果表明，振幅衰减的两个热分量态的演化公式可以看作与位移热态ρ（V，d）相同的积分形式，但受光子损耗和热噪声的共同作用所控制.此外，位移d和噪声V的值越大，热态叠加的退相干越快。
Employing the integration technique within normal products of bosonic operators, we present normal product representations of thermal-state superpositions and investigate their nonclassical features, such as quadrature squeezing, sub-Poissonian distribution, and partial negativity of the Wigner function. We also analytically and numerically investigate their evolution law and decoherence characteristics in an amplitude-decay model via the variations of the probability distributions and the negative volumes of Wigner functions in phase space. The results indicate that the evolution formulas of two thermal component states for amplitude decay can be viewed as the same integral form as a displaced thermal state ρ (V, d), but governed by the combined action of photon loss and thermal noise. In addition, the larger values of the displacement d and noise V lead to faster decoherence for thermal-state superpositions.