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\bibitem{Hadfield_etal2006} Hadfield, R. H., Habif, J. L., Schlafer, J., Schwall, R. E., \& Nam, S. W. (2006). Quantum key distribution at 1550~nm with twin superconducting single-photon detectors. \textit{Appl. Phys. Lett.}, \textit{89}(24), 241129.

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