Super-bunched bright squeezed vacuum state
  In this paper we experimentally study the statistical properties of a bright squeezed vacuum state containing up to 10^13 photons per mode (10 uJ per pulse), produced via high gain parametric down conversion (PDC). The effects of bunching and superbunching of photons were observed for a single mode PDC radiation by second-order intensity correlation function measurements with analog detectors. 
T. Sh. Iskhakov, A. Perez, K. Yu. Spasibko, M. V. Chekhova, G. Leuchs
quant-ph