Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 44: Quantum Networks (joint session QI/Q)

Q 44.4: Vortrag

Mittwoch, 12. März 2025, 15:30–15:45, HS VIII

Entanglement purification in multipartite quantum router setups with multiplexing — •Julia Alina Kunzelmann, Hermann Kampermann, and Dagmar Bruß — Heinrich Heine University Düsseldorf

Quantum routers are essential for transmitting quantum information over long distances in quantum networks. To enhance the entanglement distribution rate memory multiplexing can be used. However, quantum memories will decohere, which we compensate by entanglement purification. Our work presents an extended protocol that includes both multiplexing and entanglement purification. For entanglement purification, we use the protocol from Deutsch et al. (1996), which we apply pairwise to the quantum memories before performing GHZ measurements. Depolarized qubits in the quantum memories can be replaced or purified by new arriving qubits with higher fidelities. We analyze the fidelity of the distributed GHZ states under various network conditions. Further, we discuss different purification strategies based on our numerical simulations.

Keywords: Quantum router; Memory multiplexing; Entanglement purification