Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 33: Quantum Information: Quantum Communication 2

Q 33.1: Vortrag

Mittwoch, 16. März 2011, 14:30–14:45, SCH A118

Quantum key distribution with finite resources: Coherent vs. Collective attacks — •Markus Mertz, Silvestre Abruzzo, Sylvia Bratzik, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Germany

In QKD with finite resources it is known for the assumption of collective attacks, where the eavesdropper is forced to interact with each signal independently, how to quantify the length of a secure key. But for the most general attack (coherent attack), we have to adjust the security analysis. Based on the ideas of paper [1] we calculate the quantitative difference between coherent and collective attacks for the BB84 and the six-state protocol, with finite number of signals. Here, we use the smooth min entropy to bound the secure key rate.

[1] R. Renner, N. Gisin, and B. Kraus, Phys. Rev. A 72, 012332 (2005)