On decomposability of positive maps between and
arXiv:math/0510138
Abstract
A map $ϕ:M_m(\bC)\to M_n(\bC)$ is decomposable if it is of the form where is a CP map while is a co-CP map. A partial characterization of decomposability for maps $ϕ: M_2(\bC) \to M_3(\bC)$ is given.
7 pages