Quantum cryptography with 3-state systems
Helle Bechmann-Pasquinucci, Asher Peres
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. The security is not better, but many curious features arise.
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