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QI: Fachverband Quanteninformation

QI 18: Quantum Communication

QI 18.8: Vortrag

Donnerstag, 12. März 2026, 17:30–17:45, BEY/0245

Multiplexed multipartite quantum repeater rates in the stationary regime — •Anton Trushechkin, Julia Kunzelmann, Nikolai Wyderka, Hermann Kampermann, and Dagmar Bruß — Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Institute for Theoretical Physics III, Universitätsstr. 1, Düsseldorf 40225

We consider a multipartite quantum repeater creating GHZ states between several parties from bipartite entanglement links. Each bipartite link is characterised by a success probability, i.e., probability of successful establishment of bipartite entanglement per round. We are interested in GHZ generation rate in such repeater on long times, i.e., in the stationary regime. On an abstract level, the mathematical description is also equivalent to the usual bipartite quantum repeater chain between two parties and the corresponding bipartite entanglement generation rate. We also consider the case of memory multiplexing and study its effect on the generation rate. We derive closed-form expressions for the stationary generation rate depending on the number of parties (or the segments in a chain of bipartite repeaters) and the multiplexing number.

Keywords: quantum repeaters; GHZ states; memory multiplexity; Markov chains; asymptotic analysis