  A method based on Maximum-Entropy (ME) principle to infer photon distribution
from on/off measurements performed with few and low values of quantum
efficiency is addressed. The method consists of two steps: at first some
moments of the photon distribution are retrieved from on/off statistics using
Maximum-Likelihood estimation, then ME principle is applied to infer the
quantum state and, in turn, the photon distribution. Results from simulated
experiments on coherent and number states are presented.
