One of the possible types of n-th order ghost imaging is experimentally performed using multi-photon (higher-order) intensity correlations of pseudothermal light. It is shown that although increasing the order of intensity correlations leads to the growth of ghost imaging visibility, it at the same time reduces the signal-to-noise ratio. Therefore, ghost imaging with thermal light is optimal in the second order in the intensity.
@article{arxiv.0911.3718,
title = {Multiphoton ghost imaging with classical light},
author = {I. N. Agafonov and M. V. Chekhova and A. N. Penin},
journal= {arXiv preprint arXiv:0911.3718},
year = {2009}
}