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Geometric phase: an indicator of entanglement

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Abstract

Using a kinematic approach we show that the non-adiabatic, non-cyclic, geometric phase corresponding to the radiation emitted by a three level cascade system provides a sensitive diagnostic tool for determining the entanglement properties of the two modes of radiation. The nonunitary, noncyclic path in the state space may be realized through the same control parameters which control the purity/mixedness and entanglement. We show analytically that the geometric phase is related to concurrence in certain region of the parameter space. We further show that the rate of change of the geometric phase reveals its resilience to fluctuations only for pure Bell type states. Lastly, the derivative of the geometric phase carries information on both purity/mixedness and entanglement/separability.

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Authors and Affiliations

  1. Department of Physics, IIT Kanpur, 208016, Kanpur, India

    S.N. Sandhya

  2. Department of Physics, IIT Rajasthan, 342011, Jodhpur, India

    S. Banerjee

Authors
  1. S.N. Sandhya
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  2. S. Banerjee
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Correspondence to S.N. Sandhya or S. Banerjee.

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Sandhya, S., Banerjee, S. Geometric phase: an indicator of entanglement. Eur. Phys. J. D 66, 168 (2012). https://doi.org/10.1140/epjd/e2012-30211-5

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