SAMOP 2023 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 21: Quantum Communication II (joint session QI/Q)

QI 21.3: Vortrag

Mittwoch, 8. März 2023, 15:15–15:30, B305

Multipartite measurement device-independent quantum key distribution with quantum memories — •Julia Alina Kunzelmann, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf

Quantum repeaters build a useful tool to increase the communication distance in quantum networks. To achieve higher repeater rates, multiplexing between quantum memories can be used. We generalize the multiplexing scheme for quantum repeaters to N parties where the station performs GHZ measurements. This setup is used for measurement device-independent conference key agreement. In this work, we present a protocol that allows the distribution of a secret key in a multipartite star network via one central repeater station. We analyze the secret key rate of the protocol depending on various protocol parameters.