Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster Quantenkommunikation

Q 35.4: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster C

Comparison of Quantum Communication Protocols — •Wolfgang Mauerer and Christine Silberhorn — University Erlangen-Nuremberg, Max-Planck Research Group IOIP, Integrated Quantum Optics Group

Quantum key distribution (QKD) is presently among the most popular applications of quantum mechanics. A multitude of protocols has been proposed and security proofs have been provided which show that secret keys can be distributed between two parties even when experimental imperfections are taken into account. Solving the resulting equations for bounds on the key rates is usually not possible analytically, but requires numerical methods. We present an extensive comparison between different protocols implemented using different experimental components.

We provide a numerical tool which allows to compute many aspects of quantum key distribution systems which are of interest, especially bounds on the key generation rate. Experimental imperfections like misalignment and dark counts of detectors or channel losses are included. The analysis includes the optimisation of experimental parameters, e.g., the source intensity, to achive the best possible results. It highlights the perforance gain if improved equipment becomes available, and thus serves as a guideline as to which parts of an experiment are most benefical to be enhanced. For most protocols, both one- and two-way communication are considered.