Exposed positive maps: a sufficient condition

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Abstract

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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Quantum Physics, Mathematical Physics

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

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