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Quantum Discord and Entanglement of Quasi-Werner States Based on Bipartite Entangled Coherent States

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Abstract

Present work is an attempt to compare quantum discord and quantum entanglement of quasi-Werner states formed with the four bipartite entangled coherent states (ECS) used recently for quantum teleportation of a qubit encoded in superposed coherent state. Out of these, the quasi-Werner states based on maximally ECS due to its invariant nature under local operation is independent of measurement basis and mean photon numbers, while for quasi-Werner states based on non-maximally ECS, it depends upon measurement basis as well as on mean photon number. However, for large mean photon numbers since non-maximally ECS becomes almost maximally entangled therefore dependence of quantum discord for non-maximally ECS based quasi-Werner states on the measurement basis disappears.

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Acknowledgments

We are grateful to Prof. N. Chandra and Prof. R. Prakash for their interest and stimulating discussions. One of the authors (MKM) acknowledges the UGC for financial support under UGC-SRF fellowship scheme. One of the authors (AKM) acknowledges the CSIR for financial support under CSIR-SRF fellowship scheme.

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Authors and Affiliations

  1. Physics Department, University of Allahabad, Allahabad, 211002, India

    Manoj K. Mishra, Ajay K. Maurya & Hari Prakash

  2. Indian Institute of Information Technology, Allahabad, 211002, India

    Hari Prakash

  3. Space Applications Centre, ISRO, Ahmedabad, India

    Manoj K. Mishra

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  1. Manoj K. Mishra
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  2. Ajay K. Maurya
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  3. Hari Prakash
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Correspondence to Manoj K. Mishra.

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Mishra, M.K., Maurya, A.K. & Prakash, H. Quantum Discord and Entanglement of Quasi-Werner States Based on Bipartite Entangled Coherent States. Int J Theor Phys 55, 2735–2745 (2016). https://doi.org/10.1007/s10773-015-2906-6

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  • DOI: https://doi.org/10.1007/s10773-015-2906-6

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