2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35555We showed several years ago that the density operator of Markovian open systems can be diagonalized continuously in time. The resulting pure state jump processes correspond to quantum trajectories proposed in recent quantum optics calculations or, at fundamental level, to exact consistent histories.5pp PlainTeXGeneral Relativity and Quantum Cosmologytext