Symmetry aspects of quantum discord

Details Symmetry aspects of quantum discord Symmetry aspects of quantum discord

2010-04-13

arxiv.org/abs/1004.2082v4

Physics

Quantum Physics

Scientific paper

Quantum discord (QD) reveals the nonclassical nature of correlations in bipartite quantum states, going beyond the entanglement-separability paradigm. In this article we discuss the suitability of QD in what concern its possible asymmetry with relation to the bipartition we choose to compute it. We obtain an analytical formula for a symmetrized version of QD (SQD) in Bell-diagonal states. We observe that if correlation is regarded as a shared property, then the SQD could be a convenient quantifier for asymmetric states.

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