2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127142All quantum information processes inevitably requires the explicit state preparation of an entangled state. Here we present the construction of a quantum switchboard which can act both as an optimal quantum cloning machine and a quantum demultiplexer based on the preparation of a four-qubit state.3 pages, 1 figureQuantum Physicstext