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\bibitem{Takesue_etal2007} Takesue, H., Nam, S. W., Zhang, Q., Hadfield, R. H., Honjo, T., Tamaki, K., et al. (2007). Quantum key distribution over a 40-dB  channel loss using superconducting  single-photon detectors. \textit{Nat. Photon.}, \textit{1}, 343--348.

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