基于腔QED制备四粒子supersinglets  

Scheme for preparation of 4-qubit supersinglets in cavity QED

作　　者：张蕾[1] 王宏伟 李育康 冉锐明 蒙正琦 周琮浩 ZHANG Lei;WANG Hong-Wei;LI Yu-Kang;RAN Rui-Ming;MENG Zheng-Qi;ZHOU Cong-Hao(Huaqing College,Xi’an University of Architecture and Technology,Xi’an 710043,China)

机构地区：[1]西安建筑科技大学华清学院,西安710043

出　　处：《原子与分子物理学报》2023年第4期124-128,共5页Journal of Atomic and Molecular Physics

基　　金：陕西省教育厅专项科研项目(18JK025);西安建筑科技大学华清学院科研项目;2022年陕西省大学生创新创业训练计划项目(S202213679016)。

摘　　要：在双光子跃迁下,本文基于腔量子电动力学(QED)系统提出了一种制备4粒子supersinglets的方案.方案要求腔场最初处于真空态,依次与四个腔场发生共振作用的三能级原子最初处于激发态.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:1)该态保真度的值随原子与腔场相互作用时间的不同而不同,选择合适的原子-腔场相互作用过程以及对原子态的探测,可获得具有最大保真度的纠缠态;2)失谐量等于零时,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 scheme for preparation of 4-qubit supersinglets in microwave cavity quantum electrodynamics(QED)based on the resonant atom-cavity interaction via two-photon process is proposed.Initially,cavities are only prepared in the vacuum states and a three-levelΞ-style Rydberg atom is prepared in the excited state,and then,the atom is sequentially sent through four cavities.After an appropriate atom-cavity interaction process and measurement on the atomic state,these cavities will be projected onto the supersinglets with maximum fidelity.The influence of atom-cavity coupling constant on fidelity as well as the practical feasibility of the scheme are discussed.Numerical calculation demonstrates that the fidelity is more sensitive to the interaction time for a larger coupling constant when the detuning equals to zero,and the fidelity of the entangled state varies with the interaction time.

关 键 词：量子光学 纠缠态 supersinglets 腔QED 保真度 

分 类 号：O431.2[机械工程—光学工程]