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\bibitem{Takemoto_etal2015} Takemoto, K., Nambu, Y., Miyazawa, T., Sakuma, Y., Yamamoto, T., Yorozu, S., et al. (2015). Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors. \textit{Sci. Rep.}, \textit{5}, 14383.

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