2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124001The decay of an excited is shown to slow down in the presence of a photo detector. This is similar to the behavior of an atom in a mistuned cavity, and under the conditions of the quantum Zeno effect. No external perturbing field is applied to measure the survival probability of the unstable state.Quantum Physicstext