2002•Physical Review LettersOpen access

Optimal Eavesdropping in Cryptography with Three-Dimensional Quantum States

Dagmar Bruß, Chiara Macchiavello

Abstract

We study optimal eavesdropping in quantum cryptography with three-dimensional systems, and show that this scheme is more secure against symmetric attacks than protocols using two-dimensional states. We generalize the according eavesdropping transformation to arbitrary dimensions, and discuss the connection with optimal quantum cloning.

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Key concepts: Eavesdropping, Quantum cryptography, Quantum cloning, Computer science, Cryptography, Transformation (genetics), Quantum, Connection (principal bundle)