Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.16: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

Quantum repeater protocols assisted by single- and two-qubit memory — •Martin Steinel, Matthias Kreis, Jan Arenskötter, Stephan Kucera, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken

The generation of entanglement over long distance is a fundamental ingredient in quantum networks that may be employed for quantum key distribution or distributed quantum computing. Because of fiber loss, the transmission efficiency decreases exponentially with distance. To counteract this, quantum repeaters [1] are required. The Lütkenhaus protocol [2] promises to achieve higher entanglement rates by combining quantum repeater methods with quantum memories (QM) in the middle of the link. Focusing on an implementation based on trapped ions as quantum memories [3-5] and an SPDC source of entangled photon pairs [6], we compare protocols for a quantum repeater link using two QMs with protocols using a single QM. We consider efficiency, scalability, and rates in a case study for our existing setup.

[1] H.-J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998) [2] D. Luong et al., Appl. Phys. B 122, 96 (2016) [3] C. Kurz et al., Nat. Commun. 5, 5527 (2014) [4] C. Kurz et al., Phys. Rev. A 93, 062348 (2016) [5] M. Bock et al., Nat. Commun. 9, 1998 (2018) [6] S. Kucera et al., in preparation