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Predominance of entanglement of formation over quantum discord under quantum channels

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Abstract

We present a study of the behavior of two different figures of merit for quantum correlations, entanglement of formation and quantum discord, under quantum channels showing how the former can, counterintuitively, be more resilient to such environments spoiling effects. By exploiting strict conservation relations between the two measures and imposing necessary constraints on the initial conditions we are able to explicitly show this predominance is related to build-up of the system-environment correlations.

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Acknowledgments

The author greatly acknowledges fruitful discussions and exchanges with Drs. Mauro Paternostro, Tomasz Paterek, Laura Mazzola, Thomas Busch, Gianluca Giorgi and Dave Rea.

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Authors and Affiliations

  1. Quantum Systems Unit, Okinawa Institute of Science and Technology, Okinawa, 904-0495, Japan

    Steve Campbell

  2. Department of Physics, University College Cork, Cork, Republic of Ireland

    Steve Campbell

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Correspondence to Steve Campbell.

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Campbell, S. Predominance of entanglement of formation over quantum discord under quantum channels. Quantum Inf Process 12, 2623–2636 (2013). https://doi.org/10.1007/s11128-013-0548-2

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  • DOI: https://doi.org/10.1007/s11128-013-0548-2

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