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Q: Fachverband Quantenoptik und Photonik

Q 28: Poster Quanteninformation

Q 28.7: Poster

Tuesday, March 11, 2008, 16:30–19:00, Poster C2

Quantum cryptography with qudits using one- and two-way entanglement purification — •Kedar Ranade and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt

Well-known quantum cryptographic protocols can be generalised to qudits, i. e. to d-dimensional quantum systems. We analyse the security of these protocols using entanglement purification involving one-way and two-way classical communication, focussing on protocols which can be reduced to practically feasible prepare-and-measure schemes. We further attempt to provide precise bounds for the maximally tolerable error rates of these protocols using generic methods to determine such bounds.