2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91767Quantum Fourier transform (QFT) is a key function to realize quantum computers. A QFT followed by measurement was demonstrated on a simple circuit based on fiber-optics. The QFT was shown to be robust against imperfections in the rotation gate. Error probability was estimated to be 0.01 per qubit, which corresponded to error-free operation on 100 qubits. The error probability can be further reduced by taking the majority of the accumulated results. The reduction of error probability resulted in a successful QFT demonstration on 1024 qubits.15 pages, 6 figures, submitted to EQIS 2003 Special issue, Int. J. Quantum InformationQuantum Physicstext