第二红边带激发时强度涨落对两囚禁离子纠缠度的影响  

Influence of intensity fluctuations on entanglement of two trapped ions in second red sideband excitation

作　　者：范朝阳[1] 王中结[1] 张晓东[1] 

机构地区：[1]安徽师范大学物理与电子信息学院,芜湖241000

出　　处：《原子与分子物理学报》2011年第2期314-320,共7页Journal of Atomic and Molecular Physics

基　　金：安徽省自然科学基金(090412060);安徽省教育厅自然科学基金(KJ2008A029)支持

摘　　要：利用双光子T-C模型研究了两囚禁离子与第二红边带经典激光场相互作用时的纠缠动力学.采用共生纠缠度标准,分析了两离子初态情况,激光强度涨落等主要因素对两离子纠缠动力学的影响,并与单光子J-C模型时情形作了适当对比.结果显示:1)激光强度涨落产生的噪声使两离子纠缠度随时间呈现类似指数衰减;2)两离子初态为混合态时,两离子纠缠度出现整体急剧下降;3)双光子和单光子激发时两离子纠缠度随时间的演化存在显著差别.Entanglement dynamics of two trapped ions interacted with second red sideband classical laser field has been studied with the T-C model for two photons. By computing concurrence, we have analyzed the effect of various factors on the dynamics of entanglement of system, such as initial state of two ions and laser intensity fluctuations; a rough comparison has been also discussed between the T-C model for two photons and the J-C model for single photon. The result shows. 1） the noise produced by the intensity fluctuations makes the entanglement of two ions change with time similarly in an exponential decay way; 2） when the initial state of two ions is mixed state, the entanglement of two ions decreases rapidly; 3） there are obvious differences for entanglement dynamics with time of two trapped ions between the T-C model and the J-C model.

关 键 词：纠缠动力学 强度涨落 平均光子数 共生纠缠度 

分 类 号：O431[机械工程—光学工程]