An important result from quantum optics and condensed matter physics is the use of radiation-matter interaction to produce light with specific characteristics. In this work, we study a nonstationary atom-cavity system and characterize the physical properties of the emitted light. In particular we deal with a Fabry-Perot cavity with a moving mirror which has an embedded two-level system. The study of the statistical properties is done by means of the second-order correlation function with zero delay, which allows to classify the light emitted by the physical system in three different statistical regimes (Poissonian, sub-Poissonian and super-Poissonian) depending on the relationship between the variance and the mean of the photon number distribution. Therefore, in a range of parameters for which the extraction of excitations from the quantum vacuum is evident, we find that the non-classicality of the emitted light depends strongly on the relationship between the radiation-matter coupling constant and the frequency of modulation of the length of the cavity.

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S. Bermúdez-Feijóo, D. N. Bernal-García, and H. Vinck-Posada, "Statistical properties of light emitted from a nonstationary atom-cavity system," Proc. SPIE 10734, Quantum Nanophotonics 2018, 107340E (Presented at SPIE Nanoscience + Engineering: August 21, 2018; Published: 11 September 2018); https://doi.org/10.1117/12.2321695.