The idea of using quantum optics to protect the transmission of sensitive data is becoming a commercial reality and starting to be deployed. Duncan Graham-Rowe takes a look at recent progress in quantum cryptography.
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Graham-Rowe, D. Photons protect privacy. Nature Photon 2, 62–63 (2008). https://doi.org/10.1038/nphoton.2007.283
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DOI: https://doi.org/10.1038/nphoton.2007.283