激光强度涨落对两囚禁离子纠缠度的影响  

Influence of laser intensity fluctuations on entanglement of two trapped ions

作　　者：范朝阳[1] 王中结[1] 

机构地区：[1]安徽师范大学物理与电子信息学院,安徽芜湖241000

出　　处：《量子电子学报》2011年第5期577-582,共6页Chinese Journal of Quantum Electronics

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)资助项目

摘　　要：囚禁离子的纠缠态在量子计算和量子信息方面有极为重要的应用。由于量子系统的特性,激光强度不可避免地发生涨落,其对囚禁离子的纠缠度有显著影响。从反J-C模型出发,利用共生纠缠度标准,分析了激光强度涨落对系统纠缠动力学的影响,并与利用J-C模型时的情形做了适当对比。结果显示: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;激光强度较弱时,利用正反J-C模型所得系统纠缠动力学有显著差别。Entangled state of trapped ions has many very important applications in quantum computation and quantum information. Due to the characteristics of quantum systems, the occurrence of laser intensity fluctuations is inevitable, and it has significant influence to the entanglement of trapped ions. With the anti-model of J-C, the effect of intensity fluctuations on dynamics of entanglement of system was studied by computing concurrence and a rough comparison between the model of J-C and the anti-model of J-C was also discussed. The result shows that the noise caused by intensity fluctuation makes the entanglement of two ions weaken ＇with time similarly in an exponential way. The difference of entanglement of system between the model of J-C and the anti-model of J-C is obvious in a weaker laser field.

关 键 词：量子光学 强度涨落 平均光子数 纠缠动力学 共生纠缠度 

分 类 号：O431.2[机械工程—光学工程]