2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/209987Within the framework of quantum memory channels we introduce the notion of repeatability of quantum channels. In particular, a quantum channel is called repeatable if there exist a memory device implementing the same channel on each individual input. We show that random unitary channels can be implemented in a repeatable fashion, whereas the nonunital channels cannot.5 pages, 3 figuresQuantum Physicstext