量子电子学报, 2018, 35 (4): 451, 网络出版: 2018-08-24   

双光子纠缠体系中的非定域性和稳健性

Nonlocality and robustness in two-photon entangled system
作者单位
潍坊学院物理与光电工程学院, 山东 潍坊 261061
摘要
利用非线性晶体的II型参量下转换和极化后选择方法,制备了高品质的极化双光子纠缠态。 在双光子纠缠系统中实验测量了Clauser-Horne-Shimony-Holt (CHSH)和Cavalcanti-Bell (C-B)不等式对定域实在论的违背,得到CHSH、C-B不等式的值分别为2.64±0.021、2.75±0.019。 利用线性光学器件模拟了量子信道中的比特翻转噪声,实验研究了CHSH型不等式在比特翻转噪声环 境下的稳健性,结果表明在比特翻转噪声环境中C-B比CHSH不等式对噪声具有更强的稳健性,为进 一步研究纠缠在量子信息处理中的应用提供了实验支持。
Abstract
A high quality polarized two-photon entangled state is prepared by using the method of II type parametric down conversion and polarization post selection of nonlinear crystals. The violation of Clauser-Horne-Shimony-Holt (CHSH) and Cavalcanti-Bell (C-B) inequalities to the local realism are experimentally measured in two-photon entangled system, and the values of CHSH, C-B inequalities, 2.64±0.021 and 2.75±0.019, are obtained respectively. The bit flip noise in quantum channels is simulated by linear optical devices, and the robustness of CHSH-type inequality in bit-flipping noise environment is experimentally investigated. Results show that C-B inequality is more robust to noise than CHSH inequality in bit-flipping noise environment, which provides experimental support for further investigating the application of entanglement in quantum information processing.

赵加强, 曹连振, 杨阳, 逯怀新. 双光子纠缠体系中的非定域性和稳健性[J]. 量子电子学报, 2018, 35(4): 451. ZHAO Jiaqiang, CAO Lianzhen, YANG Yang, LU Huaixin. Nonlocality and robustness in two-photon entangled system[J]. Chinese Journal of Quantum Electronics, 2018, 35(4): 451.

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