Optimal Eavesdropping in Cryptography with Three-Dimensional Quantum States
Dagmar Bruß, Chiara Macchiavello · Physical Review Letters · 2002
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.