Flexible reconfigurable entanglement-based quantum key distribution network Till Dolejsky, Erik Fitzke, Lucas Bialowons, Maximilian Tippmann, Oleg Nikiforov and Thomas Walther Eur. Phys. J. Spec. Top., 232 20-22 (2023) 3553-3560 Published online: 12 September 2023 DOI: 10.1140/epjs/s11734-023-00980-9