光子增压缩真空态的量子特性

Quantum properties of the photon-added squeezing vacuum state

利用产生算符作用在压缩真空态上构建了光子增压缩真空态。利用有序算符积分技术,导出了它的归一化系数。通过对光场的两个正交分量涨落、二阶关联函数、Mandel Q参量的计算,研究了该量子态的非经典性质,讨论了算符作用次数和压缩参数对其量子特性的影响。研究结果表明:随压缩参数增大,态的反聚束效应和亚泊松分布性质减弱;压缩参数大于一定值后光场才呈现出压缩效应;随算符作用次数增加,态的反聚束效应减弱,但态的亚泊松分布性质却增强;增加算符作用次数对增强压缩效应有利。

The photon-added squeezing vacuum state(PASVS)is constructed by repeated application of the photon creation operator on the squeezing vacuum state.The normalization coefficient is derived by the technique of integration within an ordered product of operators.Its non-classical properties are discussed via calculating Mandel Q parameters,second-order correlation function and the fluctuations of two orthogonal components of the light field.The influences of the squeezing parameter and the repeated operating number of creation operator on quantum properties are discussed.Numerical results show:firstly,its anti-bunching effect and sub-poissonian statistical property are weakened with increase of the squeezing parameter,PASVS displays the squeezing effect when squeezing parameter is larger than a certain value;secondly,its anti-bunching effect and sub-poissonian statistical property are weakened with increasing of the repeated operating number of creation operator;thirdly,the squeezing effect is strengthened with the increasing of the repeated operating number of creation operator.