2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16432We analyse the atomic state obtained by photo-dissociation of a molecular Bose-Einstein-condensate. This process is equivalent to down-conversion in quantum optics where it is responsible for squeezing of the field amplitudes. Monte Carlo simulations derived from the Positive P description of the system, and approximate equations for second moments of the atomic field operators are introduced to describe the early stages of the process -- not amenable to the usual mean-field description.18 pages, 8 figures. Submitted to Phys. Rev. ACondensed MatterQuantum Physicstext