A subtle quantum-interference effect has been used to control the optical response of a single atom confined in a cavity. It could offer a means to develop logic gates for an optical quantum computer.
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Parkins, S. Single-atom transistor for light. Nature 465, 699–700 (2010). https://doi.org/10.1038/465699a
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DOI: https://doi.org/10.1038/465699a
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