Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 7: Quantum Communication and Networks

QI 7.5: Vortrag

Mittwoch, 7. September 2022, 16:00–16:15, H8

Average waiting times for entanglement links in multiplexed quantum networks — •Lisa Weinbrenner, Lina Vandré, and Otfried Gühne — Universität Siegen, Deutschland

In quantum communication protocols using noisy channels, the error probability typically scales exponentially with the length of the channel. To reach long-distance entanglement distribution, one can use quantum repeaters. These schemes involve first a generation of elementary bipartite entanglement links between two nodes and then measurements to combine the elementary links to a long-distance link.

Since the generation of an elementary link is probabilistic and quantum memories have a limited storage time, the generation of a long-distance link is probabilistic, too [1]. One possibility to speed up the generation of a long-distance link is a multiplexed system, in which there is more than one elementary link between two nodes [2]. In this contribution, we will present estimates and bounds on waiting times in such a system. Our results rely on an analytical treatment of the underlying stochastic process, as well as numerical investigations using the matrix product state formalism.

[1] S. Khatri et al., Phys. Rev. Research 1, 023032 (2019)

[2] O. A. Collins et al., Phys. Rev. Lett 98, 060502 (2007)