相空间内光子数增加薛定谔猫态的性质  

Properties of Photon-Added Schr?dinger Cat States in Phase Space

作　　者：丁则鹏 薛迎红 龚尚庆[1] DING Zepeng;XUE Yinghong;GONG Shangqing(Department of Physics,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学物理系

出　　处：《华东理工大学学报（自然科学版）》2019年第5期839-844,共6页Journal of East China University of Science and Technology

基　　金：国家自然科学基金青年基金(11604098);上海市自然科学基金(16ZR1447700);国家高校基本科研业务费(WM1714019)

摘　　要：相空间量子干涉技术将量子态叠加与经典光学的干涉概念相结合,深刻地展示了量子态的非经典特征出现的物理机制。利用相空间量子干涉理论对相位薛定谔猫态在光子数增加过程的特性变化进行了理论分析,通过计算其光子数分布、Q参数和Wigner函数,讨论了光子数增加对相位连续变化的薛定谔猫态的非经典特性的影响,发现随着光子数的增加薛定谔猫态趋于呈现出亚泊松分布特性以及压缩效应。Quantum interference in phase space is a technology that combines the superposition of quantum states with the concept of classical interference,and specifically and deeply reveals the physical mechanism of non-classical quantum states.In this paper,the phase space quantum interference technique is used to calculate and analyze the Schrodinger cat states with increasing photon numbers.The variation law and influencing factors of the photon number distribution of Schrodinger cat and the parameters such as Mandel Q and Wigner function,that characterize the nonclassical properties of quantum state are discussed under the condition of differently increasing photon numbers.It was found that with the increase of the photon number variation parameter,the distribution probability of phase Schrodinger's cat state in multi-photon number state would also increase.By calculating the Mandel Q parameter,we also observed that the Schr?dinger cat state which shown Poisson distribution tended to appear sub-Poisson distribution.

关 键 词：相空间量子干涉 光子数增加 相位薛定谔猫态 

分 类 号：O413.1[理学—理论物理]