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Photon correlations

The pillar of quantum optics. It is typically measured with Glauber's $g^{(2)}$.

Bunching

The historical starting point through the Hanbury Brown-Twiss effect that describes the tendency of bosons to be detected together.

Multidimensional correlations

...involving time and space or time and spatial frequency dimensions...

References

A good review is given in Ref. .