2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88899We show that, in a multi-party setting, two non-distillable (bound-entangled) states tensored together can make a distillable state. This is an example of true superadditivity of distillable entanglement. We also show that unlockable bound-entangled states cannot be asymptotically unentangled, providing the first proof that some states are truly bound-entangled in the sense of being both non-distillable and non-separable asymptotically.4 pages revtex, resubmitted with improvements after refereeQuantum Physicstext