2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89247We have made the first experimental demonstration of the simultaneous minimum uncertainty product between two complementary observables for a two-state system (a qubit). A partially entangled two-photon state was used to perform such measurements. Each of the photons carries (partial) information of the initial state thus leaving a room for measurements of two complementary observables on every member in an ensemble.4 pages, 4 figures, REVTeX, submitted to PRLQuantum Physicstext