| 高纯四光子GHZ态的实验制备及非定域性研究 |
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| 引用本文： | 曹连振,赵加强,王晓芹,逯怀新.高纯四光子GHZ态的实验制备及非定域性研究[J].中国科学(G辑),2013(9):1079-1083. |
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| 作者姓名： | 曹连振 赵加强 王晓芹 逯怀新 |
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| 作者单位： | [1]山东省多光子纠缠与操纵重点实验室,潍坊261061 [2]潍坊学院物理与光电工程学院,潍坊261061 |
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| 基金项目： | 国家自然科学基金资助项目（批准号：11174224） |
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| 摘 要： | 采用Ⅱ型参量下转换（SPDC）和后选择技术，实验上制备了保真度达0．831的高纯四光子Greenberger—Home—Zeilinger（GHZ）态．通过理论分析和实验优化，提出一种有效提高四光子对比度的实验方法．同时利用制备的纠缠态，研究了四光子GHZ态的非定域性，得到了对四光子Bell不等式28标准差的偏离，证明制备的态为真正四体纠缠态．本文的研究对实验上获得高对比度的多光子纠缠态及非定域性研究具有非常好的借鉴意义．
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| 关 键 词： | 四光子GHZ态 高对比度 Bell不等式 非定域性 |
Experimental preparation and nonlocality of the high-pure four-photon Greenberger-Horne-Zeilinger states |
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| Authors: | CAO LianZhen ZHAO JiaQiang WANG XiaoQin LU HuaiXin |
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| Institution: | . Shandong Provincial Key Laboratory of Multi-photon Entanglement and Manipulation, Weifang 261061, China 2 Department of Physics and Electronic Science, Weifang University, Weifang 261061, China |
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| Abstract: | Using the spontaneous parametric down conversion and post-selection method, we experimentally prepare the four-photon Greenberger-Horne-Zeilinger （GHZ） states with a high fidelity about 83.1%. Then, an efficiently method to improve the contrast ratio of the four-photon state is reported by theoretical analysis and experiment optimization. Based on the state, we study the local realism of this state and achieve 28 standard deviations, confirm the existence of genuine four-particle entanglement. Our work has important significance for experimental preparation and studying nonlocality of the high-fidelity multiple-photon entanglement states. |
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| Keywords: | four-photon GHZ state high contrast ratio Bell-type inequalities nonlocality |
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