2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88966Unlike classical physics, quantum mechnanics is sensitive to mistaken choice of chiralities or time-arrows of local reference systems. Quantum correlations between distant electron spins, for instance, would reveal a mistaken local chirality. Local polarization measurements and classical communication enable the distant partners to compare their local chiralities. Local time-arrows can be calibrated in a similar way.3pp, RevTeX, 2nd version with relevant correctionsQuantum PhysicsHigh Energy Physics - Theorytext