Incomplete quantum state estimation: a comprehensive study
  We present a detailed account of quantum state estimation by joint maximization of the likelihood and the entropy. After establishing the algorithms for both perfect and imperfect measurements, we apply the procedure to data from simulated and actual experiments. We demonstrate that the realistic situation of incomplete data from imperfect measurements can be handled successfully. 
Yong Siah Teo, Bohumil Stoklasa, Berthold-Georg Englert, Jaroslav   Rehacek, Zdenek Hradil
quant-ph