2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136934We present two different descriptions of positive partially transposed (PPT) states. One is based on the theory of positive maps while the second description provides a characterization of PPT states in terms of Hilbert space vectors. Our note is based on our previous results.a report based on previous resultsQuantum Physicstext