Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 69: Quanteninformation: Kommunikation

Q 69.5: Talk

Friday, March 16, 2012, 15:00–15:15, V38.04

QKD with finite resources: Taking advantage of quantum noise — •Markus Mertz, Hermann Kampermann, Zahra Shadman, and Dagmar Bruß — Institute for Theoretical Physics III, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf

We compare the effect of different types of noise models on the achievable rate of an epsilon-secure key for the BB84 and the six-state protocol. We study the situation where quantum noise is added deliberately, and investigate the remarkable benefit for the finite key rate. We compare the results to the case of added classical noise and the asymptotic key rate, i.e. in the limit of infinitely many signals. As a complementary interpretation we show that under the realistic assumption, that the noise unavoidably introduced by a real channel is not fully dedicated to the eavesdropper, the secret key rate will increase significantly.