摘要
利用多体量子纠缠度量,研究了与一维半无限波导耦合的三个两能级原子系统纠缠产生问题.考虑原子之间的距离、原子和波导之间的手性耦合和波导有限界与原子系统的距离对量子纠缠的影响.由于镜子导致的量子反馈,使得量子系统的方程为延迟微分方程.通过求解延迟微分方程,得到原子系统的量子纠缠演化.分析发现和一维无限波导情形相比,耦合于半无限波导的原子系统中产生的量子纠缠能够持续更长时间,而且其动力学特性依赖于原子之间的距离、手性耦合强度和原子的位置.在不考虑延迟情形下,分析了手性耦合对量子纠缠的影响,发现手性耦合强度越大,量子纠缠到达最大值越快,而后更快地衰减到零.研究表明可以通过控制原子之间的距离、手性耦合强度和原子的位置来制备量子纠缠.研究对理解基于波导的多体量子纠缠产生有重要意义.
Using multipartite entanglement measure, we investigate the entanglement generation among three atoms coupling to a semiinfinite waveguide. The effects of the separation distance between the atoms, the chiral coupling strength, and the distance between the finite end of the waveguide and the atoms are considered. Due to the mirror-induced quantum coherent feedback, the equations for the atoms’ state are time-delay differential equations. By simulation, we find that the entanglement among the three atoms is long-lasting, and its evolution depends on the separation distance between atoms,the chiral coupling strength, and the distance between the finite end of the mirror and the atoms. With a negligible time delay, the chiral coupling affects the entanglement evolution. The stronger the chiral coupling is, the faster the entanglement culminates and then decreases to zero. Our results indicate that the three-atom entanglement can be generated by controlling the separation distance between the atoms, the chiral coupling strength, and the distance between the finite end of the waveguide and the atoms. Our study contributes to understanding the multipartite entanglement generation based on waveguide-atom systems.
作者
马小三
王子豪
程木田
王安民
MA XiaoSan;WANG ZiHao;CHENG MuTian;WANG AnMin(School of Electric Enginering and Information,Anhui Universityof Technology Ma'anshan 243000.China;Department of Modern Physics,Universiy of Science and Technology of China,Hefei 230026,China)
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2023年第4期10-16,共7页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(编号:19075023)
国家科技部重大研发项目(编号:2018YFB601402)资助。
关键词
量子纠缠产生
半无限波导
手性耦合
quantum entanglement generation
semiinfinite waveguide
chiral couplings
作者简介
联系人:马小三,E-mail:xsma@ahut.edu.cn;联系人:程木田,E-mail:mtcheng@ahut.edu.cn。
