Exposed positive maps: a sufficient condition

Details Exposed positive maps: a sufficient condition Exposed positive maps: a sufficient condition

2011-11-08

arxiv.org/abs/1111.2012v2

J. Phys. A: Math. Theor. 45 (2012) 115304

Physics

Quantum Physics

10 pages; improved version

Scientific paper

10.1088/1751-8113/45/11/115304

Exposed positive maps in matrix algebras define a dense subset of extremal
maps. We provide a sufficient condition for a positive map to be exposed. This
is an analog of a spanning property which guaranties that a positive map is
optimal. We analyze a class of decomposable maps for which this condition is
also necessary.

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