Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quanteninformation (Quantenkommunikation)

Q 47.2: Talk

Wednesday, March 21, 2007, 16:45–17:00, 5L

Secret key rates for quantum key distribution scenarios with finite number of signals — •Tim Meyer, Hermann Kampermann, Matthias Kleinmann, and Dagmar Bruss — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany

We analyze the success of privacy amplification [1] (in terms of secret key rates) in the six-state protocol subjected to a symmetric, collective eavesdropping attack, for any finite number of signals [2]. Starting from a simple entanglement-based scheme, we can include multiphoton pulses into our model, and study its applicability for a realistic prepare-and-measure version.

• [1] R. Renner, N. Gisin, and B. Kraus, Phys. Rev. A 72, 012332 (2005).
• [2] T. Meyer, H. Kampermann, M. Kleinmann, and D. Bruß, Phys. Rev. A 74, 042340 (2006).