A fine marriage between atomic and optical physics has produced a medium that is transparent to single photons but opaque to multiple photons. The finding heralds the development of devices such as single-photon switches. See Letter p.57
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*This article and the paper under discussion2 were published online on 25 July 2012.
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Walker, T. Strongly interacting photons. Nature 488, 39–40 (2012). https://doi.org/10.1038/nature11384
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DOI: https://doi.org/10.1038/nature11384
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