2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91170The environment surrounding a quantum system can, in effect, monitor some of the systems observables. As a result, the eigenstates of these observables continuously decohere and can behave like classical states.An updated version of PHYSICS TODAY, 44:36-44 (1991) article on decoherence. Includes brief updates of many of the modern developments and referencesQuantum Physicstext