双模奇、偶相干态的反聚束效应与纠缠度的关系  

Relations between anti-bunching effect and entanglement of two-mode Schrdinger cat states

作　　者：朱波[1] 王影[1] 刘晓旭[1] 

机构地区：[1]黑龙江科技学院实训中心,哈尔滨150027

出　　处：《黑龙江科技学院学报》2008年第3期218-220,共3页Journal of Heilongjiang Institute of Science and Technology

摘　　要：为研究双模奇、偶相干态(或双模Schdinger猫态)的反聚束效应与纠缠度的关系,主要讨论了双模奇、偶相干态的二阶关联函数g(2)(τ),得出该量子态具有明显反聚束效应,并利用约化密度算符的本征值求Von Neumann熵的办法给出该态模间纠缠度。数值分析表明:双模奇、偶相干态的纠缠程度与反聚束效应都受到相位和振幅的影响,纠缠度和二阶关联函数都是相位φ的周期函数,且当纠缠度增大时其反聚束效应也逐渐增大。Aimed at the relations between the anti-bunching effect and the entanglement in twomode even/odd coherent states （two-mode Schoedinger cat states） , the paper is mainly devoted to study on the second-order correlation function g^（2） （τ） and the entanglement degree of the quantum state. The study reveals that the quantum state has an obvious anti-bunching effect. The paper offers the entanglement degree of the quantum state by calculating the Von Neumann entropy, depending on the non-negative eigenvalue of the reduced density operator. Numerical analysis reveals that both entanglement and anti-bunching effect of two even/odd coherent states, affected by phase and amplitude, are the periodic functions of phase φ. The increasing value of the entanglement in period means the increase in anti-bunching effect.

关 键 词：双模奇 偶相干态 纠缠度 反聚束效应 Von Neumann熵 

分 类 号：O431[机械工程—光学工程]