Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.47: Poster

Tuesday, March 9, 2010, 16:00–19:00, Lichthof

Secret key rates in quantum key distribution using Rényi entropies — •Silvestre Abruzzo, Hermann Kampermann, Markus Mertz, Sylvia Bratzik, and Dagmar Bruss — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany

The secret key rate r of a quantum key distribution protocol depends on the involved number of signals and the accepted "failure probability". We reconsider a method to calculate r focusing on the analysis of the privacy amplification given by [1]. This approach involves an optimization problem with an objective function depending on the Rényi entropy of the density operator describing the classical outcomes and the eavesdropper system. This problem is analyzed for a generic class of QKD protocols and the current research status is presented.

[1]R.Renner and R. König, in Second Theory of Cryptography Conference, TCC 2005, Vol. 3378 of LNCS, edited by J.Kilian (Springer, New York, 2005), pp. 407-425