压缩真空态与压缩单光子态的相干叠加态的非经典性质  

Nonclassicality of Coherent Superposition of Squeezed Vacuum State and Squeezed Single-Photon State

作　　者：罗文崴[1] 廖小鸽[1] 马善钧[1] 

机构地区：[1]江西师范大学物理与通信电子学院,江西南昌330022

出　　处：《量子光学学报》2013年第2期81-93,共13页Journal of Quantum Optics

基　　金：江西省自然科学基金(No.20114BAB202004);江西省教育厅科技项目(No.GJJ12171)

摘　　要：通过对量子比特态进行压缩操作,获得压缩真空态与压缩单光子态按一定的权重比例叠加而成的相干叠加态,此相干叠加态与压缩参数和权重因子有关,研究其非经典性和非高斯性。研究结果表明,通过压缩使得量子比特态的光子数分布范围变宽了。特别是从亚泊松分布和Wigner函数负定性情况分析了该量子态的非经典属性,从Wigner函数的边缘分布角度观察了该量子态的非高斯性。发现调节权重因子和压缩参数可以改善该态的非经典性和非高斯性。With a squeezing operation on the qubit state, we obtain a coherent superposition state of a squeezed vacuum state and a squeezed single photon state with certain weight rate. The coherent superposition state depends on the squeezing parameter and weight factor, I and its nonclassicality and non- Gaussian properties are researched. It is investigated by the sub-Poissonian statistics distribution of Mandel＇s Q parameter and the negativity of the Wigner function. The non-Gaussianity of coherent superposition qubit state can be improved by adjusting the squeezing parameter and the weight factor.

关 键 词：量子比特 WIGNER函数 非经典性 非高斯 

分 类 号：O431.2[机械工程—光学工程]