= Single-photon detector
A <photodetector> capable of registering an individual absorbed <photon> as a distinguishable event. The detection record may include a click time and an output-channel label. Such a detector need not resolve the number of <photons> in a pulse: an ordinary single-pixel <single-photon avalanche diode> produces essentially the same saturated avalanche pulse when one or several <photons> trigger the same detection interval. Detector efficiency, <dark counts> and <detector dead time> affect the observed <photon counting> statistics.
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