Although the bunching of photons emitted from an incoherent source is well known, the nanosecond response times of conventional photon-counting detectors have prevented it from being observed directly. Using the ultrafast two-photon absorption characteristics of a semiconductor detector, such effects can now be studied at femtosecond timescales.
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Scarcelli, G. Photon bunching two by two. Nature Phys 5, 252–253 (2009). https://doi.org/10.1038/nphys1241
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DOI: https://doi.org/10.1038/nphys1241
