Evidence for the superradiant behaviour of quantum dots — behaviour first described in the context of atoms in a gas over 50 years ago — suggests they can radiatively interact over distances of at least 150 nm.
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Khitrova, G., Gibbs, H. Collective radiance. Nature Phys 3, 84–85 (2007). https://doi.org/10.1038/nphys532
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DOI: https://doi.org/10.1038/nphys532
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