Three-state quantum cryptography

  title={Three-state quantum cryptography},
  author={Simon J. D. Phoenix and Stephen M. Barnett and Anthony Chefles},
We introduce a protocol for quantum key distribution using three mutually non-orthogonal states. The protocol generates key bits most efficiently for three symmetric states. The generalized measurements which minimize the error probability and maximize the mutual information for such a system are known and can be implemented optically. We analyse eavesdropping strategies based on these optimal measurements. 


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