2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90018It is proved that a quantum computer with fixed and permanent interaction of diagonal type between qubits proposed in the work quant-ph/0201132 is universal. Such computer is controlled only by one-qubit quick transformations, and this makes it feasible.5 pages, LaTeXQuantum Physicstext