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Quantum nondemolition measurement of two-photon Bell-state and three-photon Greenberger-Horne-Zeilinger-state based on weak nonlinearities

Ding Dong Yan Feng-Li

Quantum nondemolition measurement of two-photon Bell-state and three-photon Greenberger-Horne-Zeilinger-state based on weak nonlinearities

Ding Dong, Yan Feng-Li
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  • Received Date:  27 November 2012
  • Accepted Date:  17 December 2012
  • Published Online:  05 May 2013

Quantum nondemolition measurement of two-photon Bell-state and three-photon Greenberger-Horne-Zeilinger-state based on weak nonlinearities

  • 1. Department of Basic Curriculum, North China Institute of Science and Technology, Beijing 101601, China;
  • 2. College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 10971247), the Hebei Natural Science Foundation of China (Grant Nos. A2012205013, A2010000344), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. 2011B025).

Abstract: The scheme for quantum nondemolition measurement of two-photon Bell-state and three-photon Greenberger-Horne-Zeilinger (GHZ)-state is proposed based on weak nonlinearities and linear-optics elements. We first describe a scheme of the symmetry analyzer for two-photon Bell-state by using beam splitters and cross-Kerr nonlinear medium. According to this symmetry analyzer for two-photon Bell-state and the controlled-NOT gates we construct a three-photon state analyzer which can completely and nondestructively discriminate eight three-photon GHZ states.

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