利用硅线波导产生高纯度纠缠光子对。

Generation of high-purity entangled photon pairs using silicon wire waveguide.

作者信息

Harada Ken-ichi, Takesue Hiroki, Fukuda Hiroshi, Tsuchizawa Tai, Watanabe Toshifumi, Yamada Koji, Tokura Yasuhiro, Itabashi Sei-ichi

机构信息

NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, 243-0198, Japan.

出版信息

Opt Express. 2008 Dec 8;16(25):20368-73. doi: 10.1364/oe.16.020368.

DOI:10.1364/oe.16.020368

PMID:19065174

Abstract

We observed high-purity correlated and entangled photon pairs generated through spontaneous four-wave mixing (SFWM) in a silicon wire waveguide (SWW). Employing a nano-scale silicon waveguide with a low loss mode size converter, we obtained a high coincidence to accidental coincidence ratio (CAR) of around 200 that was larger than that of cooled dispersion shifted fiber (DSF) by a factor 3.2, and observed the two-photon interference fringe of time-bin entangled photons with > 95% visibility without subtracting the accidental coincidences.

摘要

我们观察到在硅线波导（SWW）中通过自发四波混频（SFWM）产生的高纯度关联和纠缠光子对。利用具有低损耗模式尺寸转换器的纳米级硅波导，我们获得了约200的高符合与偶然符合比（CAR），比冷却色散位移光纤（DSF）的该比值大3.2倍，并且在不减去偶然符合的情况下观察到了可见度大于95%的时间-bin纠缠光子的双光子干涉条纹。