On decomposability of positive maps between $M_2$ and $M_n$

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A map $ϕ:M_m(\bC)\to M_n(\bC)$ is decomposable if it is of the form $ϕ=ϕ_1+ϕ_2$ where $ϕ_1$ is a CP map while $ϕ_2$ is a co-CP map. A partial characterization of decomposability for maps $ϕ: M_2(\bC) \to M_3(\bC)$ is given.
7 pages

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Functional Analysis, Operator Algebras, 47B65, 47L07

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http://salesiana.dossiersoluciones.com/handle/123456789/103579

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0510138
 http://arxiv.org/abs/math/0510138

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arXiv