原子-腔-光纤复合系统中腔场间的纠缠特性(英文)  

Entanglement between Cavities in System of Two Atoms Trapped in Two Distant Cavities Connected by Optical Fiber

作　　者：卢道明[1] 

机构地区：[1]武夷学院电子工程系,福建武夷山354300

出　　处：《激光与光电子学进展》2011年第11期152-156,共5页Laser & Optoelectronics Progress

基　　金：福建省自然科学基金(2011J01018)资助课题

摘　　要：考虑将W态中的两个二能级原子分别注入用光纤连接的耦合腔A和B中,并且原子与腔场发生共振相互作用的情况。采用Negativity熵来描述两子系统间的纠缠,研究了原子-腔-光纤复合系统中腔场间的纠缠特性。利用数值计算方法,通过对是否进行腔外原子的选择性测量情况下腔场与腔场间的纠缠的比较,讨论了对腔外原子的选择性测量和原子与腔场间的耦合系数变化对纠缠特性的影响。研究结果表明,对腔外原子的选择性测量可增强腔场与腔场间的纠缠,另一方面,随原子与腔场间的耦合系数增大腔场间纠缠增强。The situation that two identical two-level atoms initially entangled with the third atom are separately trapped in two distant single-mode optical cavities, which are coupled by an optical fiber, is considered. The entanglement between cavities is investigated. By means of numerical calculations, through comparing the results if a direct selective measurement is performed or not, the effect of the state-selective measurement on the entanglement and that of the coupling coefficient between atom and cavity on the entanglement are discussed. The results show that the entanglement between the cavities can be strengthened through the state-selective measurement on the atom outside cavities; if the coupling coefficient between atom and cavity increases, the entanglement between cavities can also be strengthened.

关 键 词：量子光学 原子-腔-光纤复合系统 选择原子测量 量子纠缠 

分 类 号：O431.2[机械工程—光学工程]