2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/163312We analyze the problem of approximate quantum cloning when the quantum state is between two latitudes on the Bloch's sphere. We present an analytical formula for the optimized 1-to-2 cloning. The formula unifies the universal quantum cloning (UQCM) and the phase covariant quantum cloning.Quantum Physicstext