耗散双光腔调制的两原子间的纠缠  

Entanglement between Two Atoms Mediated by Two Dissipative Optical Cavities

作　　者：王成志[1] 喻小琴[1] 李春先[1] 郭裕[1] 

机构地区：[1]长沙理工大学物理与电子科学学院,湖南长沙410004

出　　处：《光学学报》2013年第B12期190-195,共6页Acta Optica Sinica

基　　金：湖南省自然科学基金（12JJ3004）、湖南省重点学科建设项目、湖南省高校科技创新团队支持计划

摘　　要：研究了两个原子分别与两个耗散相干态光腔相互作用时两个原子之间的量子纠缠，讨论了光场平均光子数、光场耗散等因素对纠缠动力学行为的影响。发现平均光子数的增大能加速纠缠衰减，增大耗散可以抑制衰减。从纠缠动力学规律来看，双原子系统可等效成非马尔可夫环境中的双量子比特体系，也可以等效成马尔可夫热库中互相耦合的两量子比特系统。对于原子初态为X形状的态，得到了稳定纠缠的表达式，发现稳定纠缠随初态平均光子数的增大而减小，随耗散系数的增大而增大，在此基础上，得到了发生纠缠死亡现象的条件。The quantum entanglement between two atoms each trapped in a dissipative cavity is studied. The effects of mean number of photons and the dissipation of the cavities on the entanglement are investigated in detail. It is found that the increase of mean number of photons can accelerate the decay of entanglement, while the intensive dissipation of the cavities restrains the decay. From the point of entanglement dynamics, the system of two atoms is equivalent to the system of two qubits subject to non-Markovian environment, and equivalent to the system of two coupled qubits exposed to the Markovian bath. For the initial X-form states of two atoms, it is found that the stationary entanglement decreases as mean number of photons increases, while increases with dissipation increasing. Based on the equation of the stationary entanglement, the conditions under which the entanglement sudden death appears are given.

关 键 词：量子光学 纠缠 主方程 马尔可夫环境 

分 类 号：O431.2[机械工程—光学工程]