Toward Photon-Efficient Key Distribution Over Optical Channels

@article{Kochman2014TowardPK,
  title={Toward Photon-Efficient Key Distribution Over Optical Channels},
  author={Yuval Kochman and Ligong Wang and Gregory W. Wornell},
  journal={IEEE Transactions on Information Theory},
  year={2014},
  volume={60},
  pages={4958-4972}
}
This paper considers the distribution of a secret key over an optical (bosonic) channel in the regime of high photon efficiency, i.e., when the number of secret key bits generated per detected photon is high. While, in principle, the photon efficiency is unbounded, there is an inherent tradeoff between this efficiency and the key generation rate (with respect to the channel bandwidth). We derive asymptotic expressions for the optimal generation rates in the photon-efficient limit, and propose… 

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