The detection of light at the single-photon level is important for tasks ranging from fluorescence imaging to quantum information processing, reports Neil Savage.
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Savage, N. Single-photon counting. Nature Photon 3, 738–739 (2009). https://doi.org/10.1038/nphoton.2009.232
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DOI: https://doi.org/10.1038/nphoton.2009.232