Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 69: Quanteninformation: Kommunikation
Q 69.2: Talk
Friday, March 16, 2012, 14:15–14:30, V38.04
Quantum repeaters and QKD: analysis of se- cret key rates — •Silvestre Abruzzo1, Sylvia Bratzik1, Hermann Kampermann1, Dagmar Bruß1, Nadja K. Bernardes2, and Peter van Loock2 — 1Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik III, Düsseldorf, Germany — 2Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light, Erlangen, Germany
Quantum repeaters[1] were proposed as a solution for increasing the distance between two parties who wish to extract a secret key using quantum key distribution. We study memory-based quantum repeaters which use entanglement distillation at most in the first nesting level. We consider three different repeater architectures: optical schemes based on the original repeater proposal [1], more advanced heralded schemes employing atomic ensembles and linear optics [2], and so-called hybrid quantum repeaters using single spins and bright light sources [3]. For each of these three models we calculate the asymptotic secret key rate and we estimate the minimal amount of resources and the minimal quality of the devices of the experimental set-up permitting to extract a secret key.
[1] H. J. Briegel et al., Phys. Rev. Lett. 81, 5932-5935 (1998).
[2] J. Minář et al., arXiv:1111.5185v1 [quant-ph]
[3] P. van Loock et al., Phys. Rev. Lett. 96, 240501 (2006).