2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217124We present a potential realization of the Greenberger, Horne and Zeilinger ALL or NOTHING contradiction of quantum mechanics with local realism using phase measurement techniques in a simple photon number triplet. Such a triplet could be generated using nondegenerate parametric oscillation.submitted to PRL, 4 pages, no figuresQuantum Physicstext