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.
- Received 27 June 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.127901
©2002 American Physical Society
