Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 52: Quanteninformation: Quantenkommunikation II

Q 52.9: Talk

Thursday, March 5, 2009, 18:30–18:45, Audi-B

Continuous-variable quantum key distribution with qudits — •Ulrich Seyfarth and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt

A generalisation of the continuous-variable protocol investigated by Grosshans and Grangier [1] is proposed. Secret key rates are evaluated for cases in which an eavesdropper can extract information by beam-splitting attacks. These rates are calculated for direct and reverse reconciliation over the channel transmittivity. Optimisations of this protocol are discussed.

[1] F. Grosshans and P. Grangier, Phys. Rev. Lett. 88,57902 (2002).