量子光学学报, 2017, 23 (3): 222, 网络出版: 2017-11-07
偏振纠缠光子对产生中的相位补偿
The Phase Compensation of the Generating Polarization Entangled Photon Pairs
自发参量下转换 偏振纠缠光子对 相位补偿 spontaneous parametric down conversion polarization entangled photon pairs phase compensation
摘要
我们通过腔增强自发参量下转换方法产生了795 nm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-NDANDD+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26±007,违背Bell-CHSH不等式857个标准差。
Abstract
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-NDANDD+NDAas 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=26±007 which violates the Bell-CHSH inequality by ~857 standard deviations.
张娜娜, 李淑静, 闫红梅, 王海. 偏振纠缠光子对产生中的相位补偿[J]. 量子光学学报, 2017, 23(3): 222. ZHANG Na-na, LI Shu-jing, YAN Hong-mei, WANG Hai. The Phase Compensation of the Generating Polarization Entangled Photon Pairs[J]. Acta Sinica Quantum Optica, 2017, 23(3): 222.