2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125127We study by comparison the structure of singlet type states in Q-bit space in the light of quantum and classical paradigms. It is shown that only the classical paradigm implies a variation in the visibility of correlation coefficients, that has been observed in fact in experiments. We conclude that Q-bit space in not a appropriate venue for an EPR test of quantum completeness.3 pages RevTeXQuantum Physicstext