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Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.23: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Key rates for practical quantum key distribution protocols — •Florian Köppen1, Tobias Moroder1, Norbert Lütkenhaus2, and Otfried Gühne11Theoretische Quantenoptik, Department Physik, Universität Siegen — 2Institute for Quantum Computing, Wa- terloo

Quantum key distribution, the method to provide secure communication, represents one of the cornerstone applications of quantum information and it has already evolved into its own research field. While the possible key rate of a generic quantum key distribution protocol is already fairly well known, its exact evaluation can often be quite tricky and cumbersome, in particular for practical implementations where one often needs to consider additional deviations between the ideal protocol and its realization. Moreover since these rates are often bounded analytically it is not clear whether one really evaluates the maximal possible rate or just a, possibly bad, lower bound of it.
In this work we develop a general method to overcome this drawback by using numerical techniques in the form of non-linear convex optimization. Via this powerful tool one can then start analyzing the exact predicted rates of various different protocols. As a primary application we investigate the behavior of implementations of the Bennett-Brassard protocol with asymmetric qubit error rates and the 2-state protocol.

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