中文摘要：

我们通过腔增强自发参量下转换方法产生了795nm窄带偏振关联光子对,利用波片组合对两个不同偏振光子之间的相位差进行了补偿,通过单光子符合计数后选择获得了偏振纠缠光子对。对两路输出光子进行D（＋45°偏振）或A（-45°偏振）偏振投影,分别在DD和DA偏振基下测量了干涉对比度V=｜NDD-NDA/NDD＋NDA｜随补偿半波片的角度变化,干涉对比度在补偿角为10°时达到最大92%。在补偿角度为10°时,测量得到纠缠光子对S值为2.6±0.07,违背Bell-CHSH不等式8.57个标准差。

英文摘要：

Using the process of cavity-enhanced spontaneous parametric down-conversion（SPDC）,we have generated 795 nm narrow-band polarization-entangled photon pairs.The phase difference between two different polarized photons is compensated by the combination of wave plates,and the polarization entangled photon pairs have been obtained in the post-selected manner by coincidence counting of single photons.The two output photons have been projected to D（＋45°）polarization or A（-45°）polarization,and we have measured the interference visibility V=｜NDD-NDA/NDD ＋NDA｜ as a function of angles of the compensated half wave plate on the basis of DD and DA polarization.The interference visibility reaches the maximum 92% when the compensation angle is 10 degrees.When the compensation angle is 10 degrees,the measured Bell parameter S=2.6±0.07 which violates the Bell-CHSH inequality by -8.57 standard deviations.