Cauchy-Schwartz不等式与时间纠缠判据  

Cauchy-Schwartz Inequality and Time Entanglement Witness

作　　者：颜辉[1] 

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006

出　　处：《合肥师范学院学报》2011年第3期23-25,共3页Journal of Hefei Normal University

基　　金：华南师范大学博士后启动项目

摘　　要：在量子光学中,利用Cauchy-Schwartz不等式可以定义不同性质的光场,从经典光场到量子光场,甚至单光子场;但是Cauchy-Schwartz不等式却不能描述时间纠缠光子对,也就是说并不是违反Cauchy-Schwartz不等式的双光子态都是时间纠缠态。本文系统介绍Cauchy-Schwartz不等式、时间纠缠判据,以及两者的关系。In quantum optics,Cauchy-Schwartz inequality is used to define different kind of optical field,such as non-coherent optical field and coherent optical field,classic optical field and quantum optical field,as well as single photon.However,the Cauchy-Schwartz inequality couldn＇t define the time entangled photon pairs,though the time entangled photon pairs violate the Cauchy-Schwartz inequality the same as all kinds of quantum optical field.In this paper,we systematically describe the Cauchy-Schwartz inequality,time entanglement witness and the relationship between the Cauchy-Schwartz Inequality and time entanglement witness.

关 键 词：CAUCHY-SCHWARTZ不等式 时间纠缠光子对 量子光场 单光子 

分 类 号：O431.2[机械工程—光学工程]