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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Information II

Q 60.3: Poster

Thursday, March 17, 2022, 16:30–18:30, P

A scalable four user quantum key hub for phase-time coding quantum key distribution — •Maximilian Tippmann, Erik Fitzke, Lucas Bialowons, Oleg Nikiforov, and Thomas Walther — TU Darmstadt, Institute of Applied Physics, 64289 Darmstadt

Quantum key distribution (QKD) systems have been widely tested with various protocols. However, there is a very limited number of experiments on QKD networks allowing the connection of more than two users within a single system. Here, we report on a QKD system with an untrusted node for simultaneous pairwise key exchange for four users based on phase-time coding. In terms of network scalability, the untrusted node consisting of an entangled photon pair source enables simultaneous operation of dozens of user pairs. Additionally, we demonstrate the interconnectibility of our system allowing plug-and-play reconfiguration of the linked parties. Our source is highly flexible to allow various operation modes in terms of repetition rates as well as integration of new coding modules.