偶极相互作用对量子纠缠信息传递与保持的影响  

Infiuence of dipole-dipole interaction on the transfer and preservation of quantum entanglement information

作　　者：王菊霞[1] 潘营利[1] 董康军[1] 

机构地区：[1]渭南师范学院物理与电子工程系,量子光学与光子学研究所,陕西渭南714000

出　　处：《激光杂志》2010年第5期24-26,共3页Laser Journal

基　　金：陕西省自然科学基金项目(SJ08A25);陕西省教育厅专项科研基金项目(08JK286)

摘　　要：依据全量子理论原理,采用时间演化算符的方法,详细探讨了等同双能级原子与单模光场在偶极共振相互作用过程中系统的时间演化特性,分析了偶极相互作用对量子纠缠信息传递或保持的影响。计算和分析表明:量子信息的传递或保持过程与原子的初态有强烈的关联,即偶极-偶极作用对W型原子,当偶极相互作用强度满足一定条件时,才能使初始原子纠缠态或光子纠缠态完全保持,不同条件下,部分保持或部分交换传递,同时出现一些混合纠缠态;而对于GHZ型原子纠缠态的传递或保持没有影响。Using the method of time-evolution operator,the time evolution properties of the system of identical two-level atoms dipole interacting resonantly with a single-mode cavity field in detail by means of quantum theory is discused.The influence of dipole-dipole interaction on the transfer and preservation of quantum entanglement information is analyzed.The calculation and analysis indicates that the procedure of the swap and conservation of quantum information depends on the initial of the atoms.For W type atoms,the initial entangled information of atoms or photons are contpletely conserved under dipole-dipole interaction intensity satisfying some conditions.It appears also the phenomenon of part exchange and preservation besides some mix entangled states under different conditions.The dipole-dipole interaction doesn＇t effect on transfer and preservation for GHZ type atom entangled states.

关 键 词：量子光学 量子纠缠信息 交换传递 保持 偶极作用 

分 类 号：O431[机械工程—光学工程]