Top panel: rate of emitted photons as a function of the modulation frequency. Bottom panels: the spectral density (arb. units) for the processes A, B, C, respectively.

From De Liberato, Carusotto, Ciuti, PRL 98, 103602 (2007)

Sketch of a possible setup for the generation of correlated photon pairs in the intersubband cavity system. The vacuum Rabi frequency of the intersubband cavity system can be modulated through an electric gate… 

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Luminescence spectrum from a photon/polariton condensate in a planar cavity.

From Chiocchetta, Carusotto, PRA 90, 023633 (2014)

Theoretical image of the density correlation pattern in a flowing Bose-Einstein condensate displaying a sonic black hole horizon emitting phonons by analog Hawking emission.

 From Carusotto et al., NJP 10 103001 (2008)