Systematic analysis of SNR in bipartite Ghost Imaging with classical and   quantum light
  We present a complete and exhaustive theory of signal-to-noise-ratio in bipartite ghost imaging with classical (thermal) and quantum (twin beams) light. The theory is compared with experiment for both twin beams and thermal light in a certain regime of interest. 
G. Brida, M.V. Chekhova, G.A. Fornaro, M. Genovese, L. Lopaeva, I. Ruo   Berchera
quant-ph