2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89061We present a proposal for protecting states against decoherence, based on the engineering of pointer states. We apply this procedure to the vibrational motion of a trapped ion, and show how to protect qubits, squeezed states, approximate phase eigenstates and superpositions of coherent states.1 figureQuantum Physicstext