2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168135The accessible information of general signal states is obtained by performing a generalized measurement. In the case that the signal alphabet consists of two states of a qubit system, it is proved that a von Neumann (orthogonal) measurement is sufficient to reach the accessible information.4 pages, 1 figureQuantum Physicstext