通信波段中偏振纠缠光子对的脉冲萨格纳克源。

Pulsed Sagnac source of polarization-entangled photon pairs in telecommunication band.

作者信息

Kim Heonoh, Kwon Osung, Moon Han Seb

机构信息

Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea.

National Security Research Institute, Daejeon, 34044, South Korea.

出版信息

Sci Rep. 2019 Mar 22;9(1):5031. doi: 10.1038/s41598-019-41633-z.

DOI:10.1038/s41598-019-41633-z

PMID:30903029

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6430775/

Abstract

We report a source of polarization-entangled photon pairs in the 1550-nm telecommunication band, which is based on non-collinear spontaneous parametric down-conversion in a periodically poled lithium niobate crystal pumped by picosecond pulses. This source is realized utilizing a polarization-based Sagnac interferometer employing a type-0 non-collinear quasi-phase-matching configuration. Polarization entanglement is verified through measurement of the polarization-correlation interference fringes with visibility >96% and by testing the experimental violation of the Clauser-Horne-Shimony-Holt (CHSH) form of Bell's inequality. The CHSH-Bell parameter S is found to be 2.72 ± 0.04, with 18 standard deviations from the statistical uncertainty.

摘要

我们报道了一种1550纳米电信波段的偏振纠缠光子对源，它基于皮秒脉冲泵浦的周期性极化铌酸锂晶体中的非共线自发参量下转换。该源通过使用基于偏振的Sagnac干涉仪实现，采用0型非共线准相位匹配配置。通过测量可见度>96%的偏振相关干涉条纹以及测试对贝尔不等式的克劳泽-霍恩-希莫尼-霍尔特（CHSH）形式的实验违背来验证偏振纠缠。发现CHSH贝尔参数S为2.72±0.04，与统计不确定性有18个标准差的偏差。