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A revisit to non-maximally entangled mixed states: teleportation witness, noisy channel and discord

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Abstract

We constructed a class of non-maximally entangled mixed states (Adhikari et al. in Quantum Inf Comput 10:0398, 2010) and extensively studied their entanglement properties and also their usefulness as teleportation channels. In this article, we have revisited our constructed state and have studied it from three different perspectives. Since every entangled state is associated with a witness operator, we have found a suitable entanglement as well as teleportation witness operator for our non-maximally entangled mixed states. We considered the noisy channel’s effects on our constructed states to see how much it affects the states’ capacities as teleportation channels. For this purpose, we have mainly focussed on amplitude damping channel. A comparative study on concurrence and quantum discord of our constructed state of Adhikari et al. (2010) has also been carried out here.

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Acknowledgements

The authors S. Roy and B. Ghosh acknowledge co-authors from their earlier paper of Ref. [1]. The authors are also grateful to Dr. Y. Huang of Institute for Quantum Information and Matter, California Institute of Technology for his valuable comments, through private communication, on quantum discord. The authors are also acknowledge Dr. Md. Manirul Ali of Physics division of National Center for Theoretical Sciences, Hsinchu, Taiwan.

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Authors and Affiliations

  1. Department of Mathematics, Techno India, EM 4/1, Salt Lake, Kolkata, 91, India

    Sovik Roy

  2. S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata, 98, India

    Sovik Roy

  3. Department of Physics, Vivekananda College for Women, Barisha, Kolkata, 8, India

    Biplab Ghosh

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  1. Sovik Roy
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Roy, S., Ghosh, B. A revisit to non-maximally entangled mixed states: teleportation witness, noisy channel and discord. Quantum Inf Process 16, 108 (2017). https://doi.org/10.1007/s11128-017-1557-3

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