2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91136The time evolution of a maximally entangled bipartite systems is presented in this paper. The distillability criterion is given in terms of Kraus operators. Using the criterion, we discuss the distillability of $2\times 2$ and $n\times n (n>2)$ systems in their evolution process. There are two distinguished processes, dissipation and decoherence, which may destroy the distillability. We discuss the effects of those processes on distillability in details.6 pages, 3 figures, published on QIC 3,39(2003)Quantum Physicstext