Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum information: Quantum communication II
Q 25.5: Talk
Tuesday, March 19, 2013, 12:00–12:15, E 214
Long-distance QKD enhanced by quantum repeaters with atomic ensembles and heralded qubit amplifiers — •Silvestre Abruzzo1, Sylvia Bratzik1, Nadja K. Bernardes2,3, Hermann Kampermann1, Peter van Loock2,3,4, and Dagmar Bruß1 — 1Institute for Theoretical Physics III, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany — 2Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1/Bau 24, 91058 Erlangen, Germany — 3Institute of Theoretical Physics I, Universität Erlangen-Nürnberg, Staudtstr. 7/B2, 91058 Erlangen, Germany — 4Institute of Physics, Johannes-Gutenberg Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany
We analyze in the context of long-distance quantum key distribution a recent quantum repeater proposal based on atomic ensembles and linear optics[1]. We investigate the impact of important experimental parameters on the final secret key rate. These parameters include the source efficiency, detector click probability and the quantum memory retrieval efficiency [2]. Moreover, we investigate the optimal number of repeater stations given a specific fixed value of the imperfections.
[1] J. Minář et al, Phys. Rev. A 85, 032313 (2012)
[2] S. Abruzzo et al, arXiv:1208.2201