Quantum Discord and the Geometry of Bell-Diagonal States

Details Quantum Discord and the Geometry of Bell-Diagonal States Quantum Discord and the Geometry of Bell-Diagonal States

2010-06-14

arxiv.org/abs/1006.2775v3

Physics

Quantum Physics

4 pages, 3 figures; new title, added proof about POVM's

Scientific paper

The set of Bell-diagonal states for two qubits can be depicted as a tetrahedron in three dimensions. We consider the level surfaces of entanglement and quantum discord for Bell-diagonal states. This provides a complete picture of the structure of entanglement and discord for this simple case and, in particular, of their nonanalytic behavior under decoherence. The pictorial approach also indicates how to show that discord is neither convex nor concave.

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