2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26593A condensate initially prepared at finite temperature evolves under external time-dependent perturbation into a time-dependent mixed state. In these notes I use number-conserving time-dependent Bogoliubov theory to derive probability distribution for different outcomes of density measurement on the time-dependent excited state.5 pages; invited talk at the conference ``Quantum Optics VI'', June 13-18, 2005, Krynica, PolandMesoscale and Nanoscale PhysicsOther Condensed Mattertext