基于腔QED制备三粒子singlet态  

Generation of Three-Qutrit singlet State Based on Cavity QED

作　　者：张蕾[1] Zhang Lei(Huaqing College,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710043,China)

机构地区：[1]西安建筑科技大学华清学院,陕西西安710043

出　　处：《激光与光电子学进展》2021年第23期350-355,共6页Laser & Optoelectronics Progress

基　　金：陕西省教育厅科研项目(18JK025)。

摘　　要：基于腔量子电动力学(QED),通过双光子过程,提出了一种制备三粒子singlet态的简单方案。一个最初处于激发态的Ξ型三能级原子依次与三个处于合适态(真空态和单光子态)的腔场发生共振作用,通过选择原子与腔场之间的相互作用时间并对原子态进行探测,可以获得具有最大保真度的singlet态。分析和讨论了该方案的可行性以及原子-腔场的耦合常数对保真度的影响。结果表明,在失谐量等于零的情况下,耦合常数越大,保真度对原子与腔场相互作用的时间越敏感。A simple scheme for the generation of three-qutrit singlet state is proposed,which is based on the cavity quantum electrodynamics(QED) by means of the two-photon transitions.Here a Ξ-type three-level atom originally prepared in the excited state sequentially resonates with three cavities prepared in suitable initial states(vacuum state or one-photon state).The singlet state with maximum fidelity can be obtained by selecting the interaction time between atom and cavity field and probing the atomic states.In addition,the influence of atom-cavity coupling constant on fidelity and the practical feasibility of the proposed scheme are discussed.The results show that in the case of detuning equal to zero,the fidelity is more sensitive to the atom-cavity interaction time for a larger coupling constant.

关 键 词：量子光学 高维纠缠态 singlet态 腔QED 保真度 

分 类 号：O431.2[机械工程—光学工程]