Photon antibunching
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Photon antibunching generally refers to a light field with photons more equally spaced than a coherent laser field,[1] a signature being signals at appropriate detectors which are anticorrelated.[2][clarification needed] More specifically, it can refer to sub-Poissonian photon statistics, that is a photon number distribution for which the variance is less than the mean. A coherent state, as output by a laser far above threshold, has Poissonian statistics yielding random photon spacing; while a thermal light field has super-Poissonian statistics and yields bunched photon spacing. In the thermal (bunched) case, the number of fluctuations is larger than a coherent state; for an antibunched source they are smaller.[3]
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