2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/160259A Quantum Key Distribution (QKD) network is currently implemented in Vienna by integrating seven QKD-Link devices that connect five subsidiaries of SIEMENS Austria. We give an architectural overview of the network and present the enabling QKD-technologies, as well as the novel QKD network protocols.10 pages, 5 figuresQuantum Physicstext