Optimal conditions for the Bell test using spontaneous parametric down-conversion sources
Optimal conditions for the Bell test using spontaneous parametric down-conversion sources
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DOI：
10.1103/physreva.98.063842
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发表时间：
2018-12-26
影响因子：
2.9
通讯作者：
Takeoka, Masahiro
中科院分区：
文献类型：
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作者：
Tsujimoto, Yoshiaki;Wakui, Kentaro;Takeoka, Masahiro
我们从理论上和实验上探讨了使用自发参数下转换（SPDC）源进行贝尔实验的最佳条件。理论上，我们表明一个相对较大的平均光子数（通常类似于0.5）是理想的，以观察clauser - horn - shimony - holt （CHSH）不等式的最大违反。此外，我们还证明了在大平均光子数的极限下，违和收敛到0.27。在实验中，我们利用SPDC源产生的1550 nm通信波长的偏振纠缠光子对进行了无后选择的Bell实验。虽然由于我们系统的整体检测效率，没有直接观察到CHSH不等式的破坏，但实验值与存在实验缺陷的理论所得值吻合得很好。此外，在较小的平均光子数(
We theoretically and experimentally investigate the optimal conditions for the Bell experiment using spontaneous parametric down-conversion (SPDC) sources. In theory, we show that a relatively large average photon number (typically similar to 0.5) is desirable to observe the maximum violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality. Moreover, we show that the violation converges to 0.27 in the limit of large average photon number. In experiment, we perform the Bell experiment without postselection using polarization-entangled photon pairs at 1550-nm telecommunication wavelength generated from SPDC sources. While the violation of the CHSH inequality is not directly observed due to the overall detection efficiencies of our system, the experimental values agree well with those obtained by the theory with experimental imperfections. Furthermore, in the range of small average photon numbers (