2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201839We analyze the structure of the subset of states generated by unital completely positive quantum maps, A witness that certifies that a state does not belong to the subset generated by a given map is constructed. We analyse the representations of positive maps and their relation to quantum Perron-Frobenius theory.14 pagesQuantum Physicstext