On two-qubit states ordering with quantum discords

Details On two-qubit states ordering with quantum discords On two-qubit states ordering with quantum discords

2011-09-19

arxiv.org/abs/1109.4132v2

Physics

Quantum Physics

5 pages, 3 figures, improvements in presentation, results unchanged, 4 references added

Scientific paper

Recently, it was discovered that quantum discord and the geometric quantum discord do not necessarily imply the same ordering of two-qubit X-states, which means that the lack of the unique ordering of states with quantum entanglement measures goes beyond entanglement. Inspired by this observation, we study the problem of the states ordering with quantum discords, considering two-qubit Bell-diagonal states for analytical simplicity.

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