Generation of polarization-entangled photon pairs in a cold atomic ensemble  

作　　者：Yuelong Wu Shujing Li Wei Ge Zhongxiao Xu Long Tian Hai Wang 

机构地区：[1]The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University [2]Collaborative Innovation Center of Extreme Optics, Shanxi University

出　　处：《Science Bulletin》2016年第4期302-306,共5页科学通报（英文版）

基　　金：the National Basic Research Program of China (2010CB923103);the National Natural Science Foundation of China (11475109, 11274211 and 60821004)

摘　　要：We report an experimental generation of polarization-entangled photon pairs in a cold atomic ensemble. A single Stokes photon and one spin-wave excitation are simultaneously created via spontaneous Raman scattering. The spin-wave excitation is then converted into an anti-Stokes photon via an electromagnetic-induced-transparency reading process. The measured cross-correlation functions between the Stokes and anti-Stokes photons for two orthogonal polarizations are -75 and 74, respectively, at a generation rate of the photon pair of -60/s. Based on such correlations, we obtain polarization-entangled photon pairs, whose Bell parameter is S = 2.77 4- 0.01, violating Bell-CHSH inequality by -77 standard deviations. The presented polarization-entangled photon source has high entanglement degree and fast generation rate, which will promise us to apply it in future quantum repeater.我们在一个冷原子整体报导纠缠极化的光子对的试验性的代。一个单身者司烧光子和光子纺纱波浪刺激同时经由散布的自发的拉曼被创造。纺纱波浪刺激然后被变换成反 -- 司烧经由一个 electromagnetic-induced-transparency 读物过程的光子。在 Stokes 和反之间的测量跨关联的功能 -- 司烧为二直角的极化的光子是分别地， 75 和 74 ~ 60/s 的光子对在代评估的 ~ 。基于如此的关联，我们获得纠缠极化的光子对， S 是其贝尔参数 ?=? 2.77 ?? ??? ??????? € 楎 ??? 猼'T 资 ? ?? ￣ ? 猼'T?? ?吗？？

关 键 词：Polarization-entangled photon pairsSpontaneous Raman scattering   Cold atomicensemble Cross-correlation function Bellparameter Spin-wave excitation 

分 类 号：O572.31[理学—粒子物理与原子核物理]