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Phys Rev Lett. 2002 Mar 25;88(12):127901. Epub 2002 Mar 8.

Optimal eavesdropping in cryptography with three-dimensional quantum states.

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Institut für Theoretische Physik, Universität Hannover, 30167 Hannover, Germany.


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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