叠加激发相干态及其非经典特性  

Superposition of excited coherent states and their non-classical properties

作　　者：蓝海江[1] 

机构地区：[1]西南交通大学量子光电实验室,四川成都610031

出　　处：《广西大学学报（自然科学版）》2010年第5期851-855,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(10874142)

摘　　要：构造由两个强度相同、相位互为共轭的激发相干态叠加而成的叠加激发相干态,计算该叠加态的Wign-er函数、二阶相干度及MandelQ因子,并据此分析其非经典特性。结果表明,叠加激发相干态的Wigner函数出现负值,其二阶相干度及MandelQ因子均小于1,说明叠加激发相干态的准概率分布出现负值,其光场具有反聚束效应,光场的光子数分布呈亚泊松分布。该叠加态是具有非经典特性的量子态。The superposition of excited coherent states was constructed by superpositioning two excited coherent states of the same intensity and mutual phase conjugation,and their Wigner functions,second-order coherence degree and Mandel Q factors were calculated,upon which their non-classical properties were analyzed.The numerical results show that,the Wigner functions of the superposition of excited coherent states may become negative,and their second-order coherence degree and Mandel Q factors are both less than 1.Hence,the research shows that the quasi-probability distribution of the superposition of excited coherent states may become negative,and their light field has anti-bunching effects,with the distribution of photon number being of sub-Poisson distribution.Therefore,these superposition states are quantum states with non-classical properties.

关 键 词：叠加激发相干态 WIGNER函数 二阶相干度 MandelQ因子 非经典特性 

分 类 号：O431.2[机械工程—光学工程]