How fast can light and matter be made to interact? 'Almost instantaneously' is the answer provided in the latest study of semiconductor structures embedded in an optical microcavity.
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Gmachl, C. Swift switch of the strong. Nature 458, 157–158 (2009). https://doi.org/10.1038/458157a
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DOI: https://doi.org/10.1038/458157a
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