2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88766The complementary roles played by parallel quantum computation and quantum measurement in originating the quantum speed-up are illustrated through an analogy with a famous metaphor by J.L. Borges.2 pages, RevTex, no figures. An excerpt from a longer (referenced) work, with a justification of the quantum speed-upQuantum Physicstext