J. Maziero, L. C. Celeri, R. M. Serra
Published 2010-04-13, updated 2011-04-18Version 4
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.
Quantum Discord and the Geometry of Bell-Diagonal States
Sudden change of quantum discord for a system of two qubits
Symmetric extension of bipartite quantum states and its use in quantum key distribution with two-way postprocessing
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