2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89470An inconsistency is pointed out within Quantum Mechanics as soon as successive joint measurements are involved on entangled states. The resolution of the inconsistency leads to a refutation of the use of entangled states as eigenvectors. Hence, the concept of quantum teleportation, which is based on the use of such entangled states--the Bell states--as eigenvectors, is demonstrated to be irrelevant to Quantum Mechanics.RevTex4, 9 pages, no figures. Section 4 on Quantum Teleportation expanded and explicited. Minor modifications in other sections. New references added. Comments are welcomeQuantum Physicstext