2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221254Quantum fluctuations of a cavity field coupled into the motion of ultracold bosons can be strongly amplified by a mechanism analogous to the Petermann excess noise factor in lasers with unstable cavities. For a Bose-Einstein condensate in a stable optical resonator, the excess noise effect amounts to a significant depletion on long timescales.4 pages, 2 figures included in textQuantum Physicstext