Coherent-state quantum cryptography holds the promise of efficient, secure communication. An experimental demonstration shows that a secure key to the code can be exchanged, even if there is a large transmission loss.
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Hillery, M. Code-breakers confounded. Nature 421, 224–225 (2003). https://doi.org/10.1038/421224a
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DOI: https://doi.org/10.1038/421224a
