2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106666We give a proposal for the physical implementation of a quantum shutter. This shutter is a mechanism able to close the passage of light through a slit when present. As it must be a quantum mechanical object, able to show superposition, interesting quantum effects are observed. Finally, we review some applications of the quantum shutter to build quantum memories and a CNOT gate.7 pages. 3 figures. Early version. Comments are welcomeQuantum Physicstext