2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107979T. D. Kieu has claimed that a quantum computing procedure can solve a classically unsolvable problem. Recent work of W. D. Smith has shown that Kieu's central mathematical claim cannot be sustained. Here, a more general critique is given of Kieu's proposal and some suggestions are made regarding the Church-Turing thesis.Quantum Physicstext