运动双原子与光场依赖强度耦合系统中的纠缠操纵与量子态制备  

Manipulation of entanglement and preparation of quantum states for moving two-atom and the light field via intensity-dependent coupling

作　　者：刘小娟[1] 周并举[1] 刘一曼[1] 姜春蕾[1] 

机构地区：[1]湖南科技大学物理学院,湘潭411201

出　　处：《物理学报》2012年第23期31-39,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11074072);湖南省自然科学湘潭联合基金(批准号:10JJ9002);湖南省自然科学基金(批准号:09JJ3012);湖南省教育厅(批准号:10A032);中国科学院红外物理国家重点实验室(批准号:201118;201119)资助的课题~~

摘　　要：将Tavis-Cummings模型推广到同时考虑原子运动及与光场依赖强度耦合的情况.运用原子约化熵和Concurrence操纵了该系统在真空场、弱相干场和强相干场条件下,双原子-场之间以及双原子之间纠缠演化特性.以此为依据,选择双原子与场相互作用时间、选取双原子纠缠因子、调节场模结构参数,控制系统纯态概率幅和选择测量,制备了双原子-场W类态、双原子Bell态、Bell态原子保真态、光场的单光子态、双光子态及稳定的数态.实现了双原子Bell态突然产生及有限时间内的保持、Bell态原子周期量子回声的形成及其信息(态)持续保真.结果表明,该系统具有强大的量子信息功能,为量子信息处理的实验实现提供了物理载体和理论参数.In this paper, the Tavis-Cummings model is generalized to simultaneously consider the atomic motion and the field via intensity dependent coupling. Under the conditions of vacuum field, weakly and strongly coherent field, the entanglement evolution properties of two-atom-field and two-atom-two-atom are investigated using atomic reduced entropy and concurrence, respectively. According to evolution characteristics above, we prepare the W-class states of two-atom-field, two-atom Bell state, fidelity state of Bell-state atoms, single-photon state, two-photon state and stable number-states of field by selecting the interaction time of the two-atom-field, selecting the entanglement factor of the two-atom, regulating the field-mode structure parameter, controlling the probability amplitude of pure state of the system and selective measurement. The manipulation of two-atom Bell state sudden generation and its maintenance in a limited time, the formation of periodic quantum echo of Bell-state atoms and the continuous fidelity of Bell-state atomic information are achieved. The results show that the system has a powerful function of quantum information, and provide the physical carder and theoretical parameters for experimental implementation of quantum information processing.

关 键 词：运动双原子 依赖强度耦合 纠缠操纵 量子态制备 

分 类 号：O431.2[机械工程—光学工程]