The realization of satellite-to-ground quantum cryptography would make quantum-secured communications possible on a global scale. Four recent breakthroughs suggest that this compelling capability could be achieved by the end of this decade.
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Hughes, R., Nordholt, J. Quantum space race heats up. Nature Photon 11, 456–458 (2017). https://doi.org/10.1038/nphoton.2017.124
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DOI: https://doi.org/10.1038/nphoton.2017.124
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