Antibunching in Light Harmonics Generation from Field Quantisation
In quantum optics, one usually deals with light which can be described in terms of a Sudarshan-Glauber phase-space distribution function. Light of this kind exhibits a positive, or at the most, a zero photon correlation (Hanbury Brown-Twiss or bunching) effect. Recently, however, it has been shown that nonlinear processes such as degenerate parametric amplification as well as two- and many-photon absorption,  can give rise to light with a negative Hanbury Brown-Twiss (antibunching) effect. Such light has no classical counterpart, and has to be treated by quantum mechanics.
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