2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/131967We present a quantum circuit that implements a non-demolition measurement of complementary single- and bi-partite properties of a two-qubit system: entanglement and single-partite visibility and predictability. The system must be in a pure state with real coefficients in the computational basis, which allows a direct operational interpretation of those properties. The circuit can be realized in many systems of interest to quantum information.4 pages, 2 figuresQuantum Physicstext