双光子连续频率变量纠缠熵  

Entangled Entropy of a Two-photon System withContinuous Frequency Systems

作　　者：翟艳花[1] 曹德忠[1] 汪凯戈[1] 

机构地区：[1]北京师范大学物理系应用光学北京市重点实验室,北京100875

出　　处：《量子光学学报》2004年第4期139-142,共4页Journal of Quantum Optics

基　　金：国家重点基础研究发展规划(973)子课题:"量子信息基础理论"(编号2001CB309310);国家自然科学基金(No.60278021)

摘　　要：介绍了连续频率变量系统中纠缠熵的计算方法。根据这种方法我们计算了自发参量下转换产生的具有高斯型频谱形式的双光子态的纠缠熵,证实了纠缠熵的大小和泵浦光带宽(σp)与下转换光带宽(σ)之比有关的直观分析。The way to quantify entanglement for a continuous variable bipartite state is discussed. The entangled entropy for a two-photon state with Gaussian continuous spectrum is calculated. The numerical simulation shows that the entanglement entropy is related to the ration of two-photon entangled state bandwidths between the pump and the down-coverted beam, and the result is consistent with the physics reality.

关 键 词：纠缠熵 双光子纠缠态 自发参量下转换 

分 类 号：O431[机械工程—光学工程]