Proof-of-concept system could lead to ultra-secure international communication.
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References
Yuan, Z.-S. et al. Nature 454, 1098–1101 (2008)
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Brumfiel, G. Quantum cryptography can go the distance. Nature (2008). https://doi.org/10.1038/news.2008.1067
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DOI: https://doi.org/10.1038/news.2008.1067