2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219941We give a new quantum circuit approximation of quantum multiplexors based on the idea of complexity theory oracles. As an added bonus, our multiplexor approximation immediately gives a quantum circuit approximation of diagonal unitary matrices.V1:5 pages (files: 3 .sty, 1 .tex);V2:corrected serious error, V1 omitted transformation that reverts ancilla to initial stateQuantum Physicstext