双模减单光子压缩真空态的量子退相干和非局域性动力学

Quantum Decoherence and Dynamics of Nonlocality for Two-mode Single-photon Subtraction Squeezed Vacuum States

本文研究了双模减单光子压缩真空态的量子退相干和非局域性动力学.数值计算了相对熵纠缠度和计算分析了线性熵纠缠度.并进一步计算了基于膺自旋算符的Bell不等式,发现Bell不等式总是违背的.因此,可以确定退相干只能减少双模减单光子压缩真空态的纠缠量,不能完全消除纠缠.

In this paper we investigate the quantum decoherence and the dynamics of nonlocality of two - mode single - photon subtracted squeezed vacuum state （TSSV）. We numerically calculate the relative entropy of the entanglement and analyze in detail the linear entropy of the entanglement. Then we calculate the Bell - CHSH inequality based upon pseudospin operators and find that the Bell inequality is always violated. Therefore, we are sure that the decoherence can only decrease the amount of the entanglement but can not eliminate the entanglement of TSSV completely.