耗散腔场中两原子间的纠缠特性  

The entangleable properties of two atoms inside the dissipative cavity

作　　者：张立辉[1] 黄晖[2] 周本元[2] 李高翔[2] 

机构地区：[1]江汉大学物理与信息工程学院,武汉430056 [2]华中师范大学物理科学与技术学院,武汉430079

出　　处：《华中师范大学学报（自然科学版）》2008年第3期376-380,共5页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(10674052)

摘　　要：研究了在大失谐条件下一位于能量耗散腔中,两个二能级原子与单模辐射场相互作用系统中原子间纠缠的时间演化特性,讨论了两原子的初始状态、腔场衰变常数以及光场的平均光子数对原子纠缠度的影响.结果表明:当两原子均处于激发态或基态时,两原子始终处于分离状态;而当两原子初始均处于激发态与基态的相干叠加态时,腔场损耗对原子纠缠度的影响随时间的演化逐渐消失,但原子偶极—偶极相互作用使原子间的纠缠程度得到加强.We have investigated the entangleable properties of two two-level atoms inside the dissipative cavity coupled to a single-mode radiation field under the big detuning, and discussed the influence of the initial state of the two atoms, the cavitity decay constant and the mean photon number on the entanglement degree. It have shown that if the two atoms are initially in the exicited or the ground states, they will be separate always; if the two atoms are initially in the coherent superposition of the excited and the ground states, the influence of cavity dissipation on the entanglement degree will vanish gradually with the time evolution, but the dipole-dipole interaction can enhance the entanglement degree.

关 键 词：耗散腔场 二能级原子 纠缠度 部分转置矩阵负本征值 

分 类 号：O431.2[机械工程—光学工程]