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Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble

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Abstract

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.

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收稿日期:2009-01-19

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网络出版日期:0001-01-01

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陆小松:Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
陈群峰:Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
史保森:Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
郭光灿:Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

备注:This work was supported by the National Natural Science Foundation of China (Nos. 10674126 and 10874171), the National Fundamental Research Program of China (Nos. 2006CB921900 and 2009CB921901), the Knowledge Innovation Program of the Chinese Academy of Sciences, and the Program for New Century Excellent Talents in University. X. Lu and Q. Chen contribute equally to this work.

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引用该论文

Xiaosong Lu, Qunfeng Chen, Baosen Shi, Guangcan Guo, "Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble," Chinese Optics Letters 7(11), 1048-1050 (2009)

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