SAMOP 2023 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 6: Poster I (joint session QI/Q)

QI 6.16: Poster

Montag, 6. März 2023, 16:30–19:00, Empore Lichthof

Design of a 4-party active base choice phase-coding quantum key distribution multi-user hub — •Adrian Klute, Maximilian Tippmann, Lucas Bialowons, Erik Fitzke, and Thomas Walther — TU Darmstadt, Institute of Applied Physics, 64289 Darmstadt

In the developing field of secure quantum communication, several quantum key distribution (QKD) systems have been tested with various protocols. However, building scalable QKD systems with more than 2 parties is a challenging task. We recently presented a 4-party star-shaped quantum hub system, which is based on time-bin entanglement. The crucial part in this setup is the precise building of interferometers. Precise building methods with sufficient reliability are needed to exchange keys with low quantum bit error rate between all user pairs of the hub. Not only the building method but also a suitable design choice of the interferometer can reduce uncertainties in the building process. In that sense we are discussing the technological challenges of two known interferometer designs for an active phase-coding protocol, a Sagnac-Michelson and a Sagnac-Mach-Zehnder configuration. We present first results to assess the success of the building method that we used.