作　　者： (张娜娜）; (李淑静）; (闫红梅）; (王海）;

机构地区： 山西大学光电研究所量子光学与光量子器件国家重点实验室,山西太原030006 山西大学极端光学协同创新中心,山西太原030006

出　　处： 《量子光学学报》 2017年第3期222-227,共6页

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。 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.

关 键 词： 自发参量下转换 偏振纠缠光子对 相位补偿