Spectral properties of high-gain parametric down-conversion
  High-gain parametric down-conversion (PDC) is a source of bright squeezed vacuum, which is a macroscopic nonclassical state of light and a promising candidate for quantum information applications. Here we study its properties, such as the intensity spectral width and the spectral width of pairwise correlations. 
Kirill Yu. Spasibko, Timur Sh. Iskhakov, Maria V. Chekhova
quant-ph