2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117120Every dXd bipartite system is shown to have a large family of undistillable states with nonpositive partial transpose (NPPT). This family subsumes the family of conjectured NPPT bound entangled Werner states. In particular, all one-copy undistillable NPPT Werner states are shown to be bound entangled.4 pages, RevtexQuantum Physicstext