耦合双Tavis-Cummings模型中的纠缠演化和转移特性  

Entanglement Evolution and Transfer in the Coupled Double Tavis-Cummings Model

作　　者：贾冉[1] 张英杰[1] 夏云杰[1] 

机构地区：[1]曲阜师范大学物理系山东省激光偏光与信息技术重点实验室,山东曲阜273165

出　　处：《光学学报》2012年第11期250-257,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61178012);山东省自然科学基金(ZR2012FQ024)资助课题

摘　　要：研究了由光纤模连接的两个Tavis-Cummings模型中纠缠演化和纠缠转移的特性。结果表明,初始两原子间的纠缠可转移为另两原子间的纠缠,在纠缠转移过程中,光纤模起到中间传递的作用。纠缠的转移与初始两原子间的纠缠、原子与腔场的耦合强度以及光纤模与腔场的耦合强度、原子与腔场的失谐量和腔场耗散有关。初始纠缠决定了另两原子间纠缠产生的大小;在原子与腔场的耦合强度一定的条件下,随着光纤模与腔场耦合强度的增强,纠缠转移的时间缩短,且产生的纠缠值增加;腔场耗散对纠缠演化的衰减影响是显著的,而失谐量的增加可以有效地抑制这一现象。在整个纠缠转移过程中,系统中其他任两子体系间的纠缠起到了桥梁的作用,实现了两量子纠缠态的远程传递和制备。The entanglement evolution and transfer optical fiber are investigated. The results show that other two atoms, and the optical-fiber mode plays a The entanglement transfer can be influenced by the of the double Tavis-Cummings model which are connected by the the initial entanglement between two atoms can transfer to the part in transmission during the entanglement transfer process. initial entanglement and the coupling strength not only between atom and cavity but also between optical fiber and cavity. The detuning between atom and cavity field and the cavity dissipation can also have an effect on the entanglement transfer. The initial entanglement can decide the value of generated concurrence, when the coupling strength between atom and cavity field is given, the stronger the coupling strength between optical fiber and cavity is, the shorter time of the entanglement transfer will be and the lager value of generated concurrence entanglement will be. Although the cavity dissipation makes the entanglement decay obviously, the detuning can restrain this phenomenon. During the whole entanglement transfer process, the concurrence between any other two subsystems in the system plays a role of bridge and this system can realize the teleportation and preparation of the bipartite entanglement state.

关 键 词：量子光学 纠缠转移 共生纠缠 耦合双Tavis—Cummings模型 

分 类 号：O431.2[机械工程—光学工程]