增光子奇偶相干态的相位特性  

Phase Properties for the Photon-Added Even and Odd Coherent States

作　　者：孟祥国[1] 王继锁[1] 梁宝龙[1] 

机构地区：[1]聊城大学物理系,聊城252059

出　　处：《光学学报》2007年第4期721-726,共6页Acta Optica Sinica

基　　金：国家自然科学基金(10574060);山东省自然科学基金(Y2004A09)资助的课题

摘　　要：借助于Pegg-Barnett相位算符理论和数值计算方法,研究了增光子奇偶相干态的相位概率分布,在此基础之上,讨论了有关数算符和相位算符的压缩特性。结果表明,增光子奇偶相干态的相位概率分布与通常的奇偶相干态、非线性相干态不同,在这种新的奇偶相干态中,其Pegg-Barnett相位概率分布能明显地反映出不同的量子相位信息和干涉特性。同时发现,在参量α的某些不同的取值范围内,增光子奇偶相干态在数算符和相位算符分量上均存在压缩效应。By virtue of the Pegg-Barnett phase operator formalism and the numerical computation method, the phase probability distributions and the squeezed properties of number operator and phase operator for the photonadded even and odd coherent states are investigated. The results show that the phase probability distributions, which exhibit different quantum phase information and interference features, of the photon-added even and odd coherent states are different from those of the usual even and odd coherent states and even and odd nonlinear coherent states. We also find that the photon-added even and odd coherent states exhibit squeezed effects in the directions of the number operator and phase operator at different ranges of the parameter ｜α ｜ .

关 键 词：量子光学 增光子奇偶相干态 Pegg—Barnett相位算符 相位概率分布 压缩效应 

分 类 号：O431.2[机械工程—光学工程]