Quantum cryptography has been suggested as a way for two people to communicate in perfect secrecy. Now it has been shown practically that more than one listener can be brought in.
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Hughes, R. Quantum security is spookily certain. Nature 385, 17–18 (1997). https://doi.org/10.1038/385017a0
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DOI: https://doi.org/10.1038/385017a0
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