用于高保真光纤基光子对源的模式扩展和布拉格滤波

Mode expansion and Bragg filtering for a high-fidelity fiber-based photon-pair Source.

作者信息

Ling Alexander, Chen Jun, Fan Jingyun, Migdall Alan

机构信息

National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

出版信息

Opt Express. 2009 Nov 9;17(23):21302-12. doi: 10.1364/OE.17.021302.

DOI:10.1364/OE.17.021302

PMID:19997369

Abstract

We report the development of a fiber-based single spatial-mode source of photon-pairs where the efficiency of extracting photon-pairs is increased through the use of fiber-end expansion and Bragg filters. This improvement in efficiency enabled a spectrally bright and pure photon-pair source having a small second-order correlation function (0.03) and a raw spectral brightness of 44,700 pairs s(-1)nm(-1)mW(-1). The source can be configured to generate entangled photon-pairs, characterized via optimal and minimal quantum state tomography, to have a fidelity of 97% and tangle of 92%, without subtracting any background.

摘要

我们报告了一种基于光纤的单空间模式光子对源的开发情况，其中通过使用光纤末端扩展和布拉格滤波器提高了提取光子对的效率。这种效率的提高使得能够获得一个光谱明亮且纯净的光子对源，其具有小的二阶关联函数（0.03）和44,700对 s(-1)nm(-1)mW(-1)的原始光谱亮度。该源可以配置为生成纠缠光子对，通过最优和最小量子态层析成像进行表征，在不减去任何背景的情况下，保真度为97%，纠缠度为92%。