The Wigner function and phase properties of superposition of two coherent states with the vacuum state  

作　　者：王月媛 王继成 刘树田 

机构地区：[1]Department of Physics,Harbin Institute of Technology [2]Key Laboratory for Advanced Functional Materials and Excited State Process of Heilongjiang Province,School of Physics and Electronic Engineering,Harbin Normal University

出　　处：《Chinese Physics B》2010年第7期268-275,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10674038 and 10974039);the National Basic Research Program of China (Grant No. 2006CB302901)

摘　　要：This paper discusses some statistical properties of the superposition of two coherent states with a vacuum state, such as sub-Poissonian photon statistics and negativity of the Wigner function. Phase probability distribution and phase variance are calculated. Special cases of the constructed superposition states are presented. The results show that depending on the vacuum state coefficient γ and the coherent state coefficient a, it can generate a variety of nonclassical states.This paper discusses some statistical properties of the superposition of two coherent states with a vacuum state, such as sub-Poissonian photon statistics and negativity of the Wigner function. Phase probability distribution and phase variance are calculated. Special cases of the constructed superposition states are presented. The results show that depending on the vacuum state coefficient γ and the coherent state coefficient a, it can generate a variety of nonclassical states.

关 键 词：coherent states vacuum state Wigner distribution function phase properties 

分 类 号：O431.2[机械工程—光学工程]