制备EPR纠缠态的一种简易方法  

A Simple Scheme of Generating EPR Entangled States

作　　者：朱洪波[1] 杨伯君[1] 

机构地区：[1]北京邮电大学理学院,北京100876

出　　处：《北京邮电大学学报》2004年第4期55-58,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60378011)

摘　　要：从理论上论证了连续变量的EPR纠缠态可以通过利用普通分束器分离一束单模压缩光或光孤子压缩态而得到.据所知这是制备纠缠态的最简方案.根据推导出的具体公式分析了2种非经典光场——压缩态和纠缠态之间的关系以及压缩程度对形成纠缠态的影响.It is theoretically proved that the two output light beams can be used as a pair of EPR(Einstin-Podolsky-Rosen) entangled beams when the incident light upon a beam splitter is a single mode quadrature-squeezed coherent state or a squeezed quantum soliton. It is the simplest scheme for preparing entangled states to our knowledge. The formulas explicitly show the correlation between the two nonclassical optical fields: squeezed states and entangled states. The affection of squeezing degree on entanglement is also investigated.

关 键 词：纠缠 压缩态 分束器 条件方差 

分 类 号：O431.2[机械工程—光学工程]