基于腔QED制备三原子W纠缠态  

Preparation of three-atomW state in cavity QED

作　　者：张蕾[1] 郝丹辉[1] 强稳朝[2] ZHANG Lei;HAO Danhui;QIANG Wenchao(Huaqing College,Xi’an University of Architecture and Technology,Xi’an 710043,China;School of Science,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学华清学院,陕西西安710043 [2]西安建筑科技大学理学院,陕西西安710055

出　　处：《量子电子学报》2020年第6期685-691,共7页Chinese Journal of Quantum Electronics

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),提出了一种利用Ξ-型三能级原子与单模腔场发生非共振相互作用制备三原子W纠缠态的方案。该方案要求三个三能级原子和一个单模腔场,腔场最初处于真空态,与腔场作用的第一个和第二个原子最初均处于激发态,第三个原子处于基态。分析和讨论了该方案的实验可行性以及失谐量δ对保真度的影响。研究结果表明:1)当原子与腔场之间的相互作用时间不同时,获得该纠缠态的保真度以及相应的成功几率不同,通过选择合适的原子与腔场之间的相互作用时间可以获得具有最大保真度的W纠缠态;2)在耦合常数不同的情况下,失谐量δ对保真度的影响程度不同。此外,研究表明该方案可以推广至制备任意分权重的W态。A scheme for preparing three-atomWstate via nonresonant interaction betweenΞ-type threelevel Rydberg atoms and a single-mode cavity in cavity quantum electrodynamics(QED)is proposed.The scheme requires three three-level atoms and one single-mode cavity.The cavity field is initially in the vacuum state,the first and second atoms interacting with the cavity are initially in the excited state,while the third atom is in the ground state.The practical feasibility of the scheme and the influence of detuningδon fidelity are analyzed and discussed.Numerical calculation demonstrates that the fidelity and the corresponding success probability of the entangled state is different when the atom-field interaction time is different,andWstates with maximized fidelity can be obtained by choosing the appropriate interaction time.It is also shown that in the case of different coupling constants,the effect of detuningδon fidelity is different.According to this work,it is shown that the scheme can be generalized to prepare W state with arbitrary weight.

关 键 词：量子光学 量子纠缠 W纠缠态 非共振 腔量子电动力学 保真度 

分 类 号：O431.2[机械工程—光学工程]