2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219337Performances of the symmetric universal and phase-covariant cloning transformations and entanglement cloners -- qubit case -- are investigated when the initial state of the hardware or the original state to be cloned is weakly coupled to a thermal environment. Different behaviors of each of these transformations are analyzed and contrasted with the ideal cases.Quantum Physicstext