2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44538Einstein's revolutionary light quantum hypothesis of 1905 and his further contributions to quantum theory are reviewed.Invited talk at the Hadron Collider Physics Symposium (HCP2005) July 4-9 2005, Les Diablerets, Switzerland, 13 pagesHigh Energy Physics - PhenomenologyQuantum Physicstext