Photon antibunching is a quantum optical phenomenon that occurs when photons emitted from a source are detected in such a way that they exhibit a reduced probability of being detected in pairs (or bunches) compared to what would be expected from classical light sources. This effect is a key signature of non-classical light and is often observed in light emitted by single quantum emitters, such as single atoms, quantum dots, or single molecules.
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Photon antibunching means suppression of close pairs compared with pairs at some later delay: for some . If correlations decay to the independent-count reference, is a sufficient signature. It violates the classical intensity bounds in photon bunching. For the specified single-mode number measurement, second-order optical coherence also shows that is equivalent to . This variance criterion concerns that mode or gate; it must not be applied unchanged to arbitrarily long integrated counting intervals.