Faithful nonclassicality indicators and extremal quantum correlations in two-qubit states

Details Faithful nonclassicality indicators and extremal quantum correlations in two-qubit states Faithful nonclassicality indicators and extremal quantum correlations in two-qubit states

2010-08-24

arxiv.org/abs/1008.4136v2

J. Phys. A: Math. Theor. 44, 352002 (2011)

Physics

Quantum Physics

7 pages, 2 figures, 1 table. Published version

Scientific paper

10.1088/1751-8113/44/35/352002

The state disturbance induced by locally measuring a quantum system yields a signature of nonclassical correlations beyond entanglement. Here we present a detailed study of such correlations for two-qubit mixed states. To overcome the asymmetry of quantum discord and the unfaithfulness of measurement-induced disturbance (severely overestimating quantum correlations), we propose an ameliorated measurement-induced disturbance as nonclassicality indicator, optimized over joint local measurements, and we derive its closed expression for relevant two-qubit states. We study its analytical relation with discord, and characterize the maximally quantum-correlated mixed states, that simultaneously extremize both quantifiers at given von Neumann entropy: among all two-qubit states, these states possess the most robust quantum correlations against noise.

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