On decomposability of positive maps between M2 and Mn
Wladyslaw A. Majewski, Marcin Marciniak
math.FAarXiv:math/0510138
Abstract
A map ϕ:Mm() Mn() is decomposable if it is of the form ϕ=ϕ1+ϕ2 where ϕ1 is a CP map while ϕ2 is a co-CP map. A partial characterization of decomposability for maps ϕ: M2() M3() is given.
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