Decoherence of photon-subtracted squeezed vacuum state in dissipative channel  

作　　者：徐学翔 袁洪春 范洪义 

机构地区：[1]College of Physics and Communication Electronics,Jiangxi Normal University [2]Department of Physics,Shanghai Jiao Tong University

出　　处：《Chinese Physics B》2011年第2期239-246,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10775097);the Key Program Foundation of the Ministry of Education of China (Grant No. 210115);the Research Foundation of the Education Department of Jiangxi Province of China (Grant No. GJJ10097)

摘　　要：This paper investigates the decoherence of photo-subtracted squeezed vacuum state （PSSVS） in dissipative channel by describing its statistical properties with time evolution such as Wigner function, Husimi function, and tomogram. It first calculates the normalization factor of PSSVS related to Legendre polynomial. After deriving the normally ordered density Operator of PSSVS in dissipative channel, one obtains the explicit analytical expressions of time evolution of PSSVS＇s statistical distribution function. It finds that these statistical distributions loss their non-Gaussian nature and become Gaussian at last in the dissipative environment as expected.This paper investigates the decoherence of photo-subtracted squeezed vacuum state （PSSVS） in dissipative channel by describing its statistical properties with time evolution such as Wigner function, Husimi function, and tomogram. It first calculates the normalization factor of PSSVS related to Legendre polynomial. After deriving the normally ordered density Operator of PSSVS in dissipative channel, one obtains the explicit analytical expressions of time evolution of PSSVS＇s statistical distribution function. It finds that these statistical distributions loss their non-Gaussian nature and become Gaussian at last in the dissipative environment as expected.

关 键 词：photon-subtracted squeezed vacuum state Wigner function Husimi function TOMOGRAM 

分 类 号：O431.2[机械工程—光学工程]