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Q: Quantenoptik und Photonik

Q 7: Quantenkommunikation

Q 7.3: Talk

Monday, March 22, 2004, 17:00–17:15, HS 101

Robustness of the BB84 Quantum Key Distribution Against Collective Attacks — •Georgios Nikolopoulos and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt

Quantum key distribution protocols exploit quantum correlations in order to establish a secure key between two legitimate users. Recent work on quantum cryptography [1-3] has revealed a remarkable link between quantum and secret correlations. So far, it is not known, however, what is the maximum disturbance (upper robustness bound) up to which Alice and Bob can share non-classical correlations and what an eavesdropper can achieve by employing an appropriately optimized strategy. We present recent results concerning these upper robustness bounds for the BB84 protocol under the assumption of general coherent eavesdropping strategies.
/1/ M. Curty, M. Lewenstein, and N. Lütkenhaus, quant-ph/0307151 (2003).
/2/ A. Acin and N. Gisin, quant-ph/0310054 (2003).
/3/ A. Acin, L. Masanes, and N. Gisin, Phys. Rev. Let. 91, 167901 (2003).