双光子连续频率变量纠缠熵

Entangled Entropy of a Two-photon System withContinuous Frequency Systems

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.