Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble
We experimentally establish a non-classical correlation between a single Stokes photon and the collective spin excited state of a cold atomic ensemble by using a spontaneous Raman scattering process.The correlation between them can be proved by transferring the spin excited state of the atomic ensemble into an anti-Stokes photon and checking the Cauchy-Schwarz inequality between the Stokes and the anti-Stokes photons.The non-classical correlation can be kept for at least 300 ns.
作 者： Xiaosong Lu Qunfeng Chen BaosenShi Guangcan Guo 作者单位： Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China 刊 名： 中国光学快报(英文版) ISTIC EI 英文刊名： CHINESE OPTICS OF LETTERS 年，卷(期)： 2009 7(11) 分类号： 关键词：