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Q: Quantenoptik und Photonik

Q 22: Poster Quanteninformation, -kommunikation und -computer

Q 22.9: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

Incoherent and Coherent Symmetric Attacks in Entanglement-Based Cryptography — •Aeysha Khalique, Georgios Nikolopoulos, and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt

Quantum Cryptography is one of the first practical applications of quantum mechanics. A main goal in quantum cryptography is to achieve unconditional secure quantum key distribution between two communicating parties, Alice and Bob, in the presence of a third intervening party, typically called Eve. We analyze symmetric incoherent and coherent attacks by Eve in entanglement-based cryptographic protocols [1,2]. In particular we address questions concerning security limits in cases in which Eve has complete control over the preparation of the entangled state shared between Alice and Bob.
/1/ H. Inamori, L. Rallan and V. Vedral, J. Phys. A 35, 6913 (2001).
/2/ H. Bechmann-Pasquinucci and N. Gisin, Phys. Rev. A. 59, 4238 (1999).