2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217145It is shown that if one can perform a restricted set of fast manipulations on a quantum system, one can implement a large class of dynamical evolutions by effectively removing or introducing selected Hamiltonians. The procedure can be used to achieve universal noise-tolerant control based on purely unitary open-loop transformations of the dynamics. As a result, it is in principle possible to perform noise-protected universal quantum computation using no extra space resources.4 pages, no figures; REVTeX styleQuantum Physicstext