2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137452Quantum expanders are a natural generalization of classical expanders. These objects were introduced and studied by Ben-Aroya and Ta-Shma and by Hastings. In this note we show how to construct explicit, constant-degree quantum expanders. The construction is essentially the classical Zig-Zag expander construction, applied to quantum expanders.7 pagesQuantum Physicstext