Quantum key distribution using two coherent states of light and their superposition

@article{Nambu2000QuantumKD,
  title={Quantum key distribution using two coherent states of light and their superposition},
  author={Yoshihiro Nambu and Akihisa Tomita and Yoshie Chiba-Kohno and K Nakamura},
  journal={Physical Review A},
  year={2000},
  volume={62},
  pages={012312}
}
Quantum mechanical complementarity ensures the security of the key-distribution scheme reported by Brassard and Bennet in 1984 (BB84), but does not prohibit use of multi-photons as a signal carrier. We describe a novel BB84 scheme in which two nearly orthogonal coherent states carry the key, and the superposition of these states (cat states) protects the communication channel from eavesdropping. Information leakage to eavesdroppers can be determined from the visibility of the interferential… 
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