Flexible reconfigurable entanglement-based quantum key distribution network
Till Dolejsky, Erik Fitzke, Lucas Bialowons, Maximilian Tippmann, Oleg Nikiforov, Thomas Walther · The European Physical Journal Special Topics · 2023
Abstract Recently, we implemented a basic star-shaped entanglement-based quantum key distribution network without trusted nodes. It enables simultaneous pairwise exchange of quantum keys between multiple users. In this paper, we demonstrate its flexibility by focusing on several aspects. We show continuous system operation over a partially deployed 100 km fiber link for multiple days as well as dynamic reconfiguration of the communication partners. The photon pair source enables type-II or type-0 photon pair generation by SPDC as well as various demultiplexing strategies and repetition rates.