Abstract
We consider quantum cryptographic schemes where the carriers of information are 3-state particles. One protocol uses four mutually unbiased bases and appears to provide better security than obtainable with 2-state carriers. Another possible method allows quantum states to belong to more than one basis. Security is not better, but many curious features arise.
- Received 24 January 2000
DOI:https://doi.org/10.1103/PhysRevLett.85.3313
©2000 American Physical Society
