Measurement of Photon Statistics with Live Photoreceptor Cells
  We analyzed the electrophysiological response of an isolated rod photoreceptor of Xenopus laevis under stimulation by coherent and pseudo-thermal light sources. Using the suction electrode technique for single cell recordings and a fiber optics setup for light delivery allowed measurements of the major statistical characteristics of the rod response. The results indicate differences in average responses of rod cells to coherent and pseudo-thermal light of the same intensity and also differences in signal-to-noise ratios and second order intensity correlation functions. These findings should be relevant for interdisciplinary studies seeking applications of quantum optics in biology. 
Nigel Sim, Mei Fun Cheng, Dmitri Bessarab, C. Michael Jones, and   Leonid A. Krivitsky
physics.bio-ph physics.optics quant-ph