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Quantum discord and the geometry of Bell-diagonal states.

Authors
  • Lang, Matthias D
  • Caves, Carlton M
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Oct 08, 2010
Volume
105
Issue
15
Pages
150501–150501
Identifiers
PMID: 21230879
Source
Medline
License
Unknown

Abstract

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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