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MON: Monday Contributed Sessions

MON 17: Quantum Communication and Networks: Theory

MON 17.5: Talk

Monday, September 8, 2025, 17:30–17:45, ZHG006

Quantum conference key agreement in pair-entangled networks: Fundamental bounds — •Anton Trushechkin, Justus Neumann, Hermann Kampermann, and Dagmar Bruß — Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Institute for Theoretical Physics III, Universitätsstr. 1, Düsseldorf 40225

Networks of nodes connected by sources of bipartite entangled states are in focus. The nodes can perform collective measurements on the particles coming from different sources. After many repetitions of such rounds, the nodes postprocess the obtained data to agree on a secret conference key. This scenario is relevant to future quantum networks. We derive fundamental bounds on the conference key generation rate based on properties of the graph of the network. In particular, the bounds can reveal global bottleneck structures in the network, i.e., node partitions that set tightest restrictions the conference key rate.

Keywords: quantum networks; entanglement; conference key agreement; fundamental information-theoretic bounds