Long-distance secure quantum communication has long been one of the goals of quantum optics research. Ambitions are now growing following the realization of fibre-based links to free-space satellite–ground communication networks.
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Horiuchi, N. Expanding ambitions. Nature Photon 9, 13–14 (2015). https://doi.org/10.1038/nphoton.2014.310
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DOI: https://doi.org/10.1038/nphoton.2014.310
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