Optimal Eavesdropping in Cryptography with Three-Dimensional Quantum States

D. Bruß, C. Macchiavello
2002 Physical Review Letters  
We study optimal eavesdropping in quantum cryptography with three-dimensional systems, and show that this scheme is more secure than protocols using two-dimensional states. We generalize the according eavesdropping transformation to arbitrary dimensions, and discuss the connection with optimal quantum cloning.
doi:10.1103/physrevlett.88.127901 pmid:11909501 fatcat:gptcwgxvizbafhw27iuqzcopli