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Concentrating partially entangledW-class states on nonlocal atoms using low-Q optical cavity and linear optical elements

查看全文 作　　者：Cong [1,2]Cao;Xi [1,2]Chen;YuWen [1,2]Duan;Ling [2]Fan;Ru [1,2]Zhang;[3]TieJunWang;Chuan [1,3]Wang 高影响力作者 机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications;[2]School of Ethnic Minority Education, Beijing University of Posts and Telecommunications;[3]School of Science, Beijing University of Posts and Telecommunications高影响力机构 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2016年第59卷第10期,共7页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61471050,61377097,11404031 and 61571060);the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China(Grant No.151063);the Fundamental Research Funds for the Central Universities(Grant No.2015RC28);the Fund of State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications)(Grant No.IPOC2015ZT05) 摘　　要：Entanglement plays an important role in quantum information science, especially in quantum communications. Here we present an efficient entanglement concentration protocol(ECP) for nonlocal atom systems in the partially entangled W-class states, using the single-photon input-output process regarding low-Q cavity and linear optical elements. Compared with previously published ECPs for the concentration of non-maximally entangled atomic states, our protocol is much simpler and more efficient as it employs the Faraday rotation in cavity quantum electrodynamics(QED) and the parameter-splitting method. The Faraday rotation requires the cavity with low-Q factor and weak coupling to the atom, which makes the requirement for entanglement concentration much less stringent than the previous methods, and achievable with current cavity QED techniques. The parameter-splitting method resorts to linear-optical elements only. This ECP has high efficiency and fidelity in realistic experiments, and some imperfections during the experiment can be avoided efficiently with currently available techniques. 关 键 词：光学元件 原子系统 低品质 非局域 光学谐振腔 线性 浓缩 腔QED技术
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