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PHYSICS LETTERS A
Volume 354, Issue 1-2, Pages 1-7Publisher
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DOI: 10.1016/j.physleta.2006.01.015
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We analyze the nonlinear optical response of a five-level system under a novel configuration of electro-magnetically induced transparency. We show that a giant Kerr nonlinearity with a relatively large cross-phase modulation coefficient that occurs in such system may be used to produce an efficient photon-photon entanglement. We demonstrate that such photon-photon entanglement is practically controllable and hence facilitates promising applications in quantum information and computation. (c) 2006 Elsevier B.V. All rights reserved.
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