2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/212020We propose a feedback scheme to control the vibrational motion of a single trapped particle based on indirect measurements of its position. It results the possibility of a motional phase space uncertainty contraction, correponding to cool the particle close to the motional ground state.9 pages, 1 figure. Concluding section and figure revised. In press on Phys. rev. AQuantum Physicstext