Interferometry as a binary decision problem
  Binary decision theory has been applied to the general interferometric problem. Optimal detection scheme-according to the Neyman-Pearson criterion-has been considered for different phase-enhanced states of radiation field, and the corresponding bounds on minimum detectable phase shift has been evaluated. A general bound on interferometric precision has been also obtained in terms of photon number fluctuations of the signal mode carrying the phase information. 
Matteo G. A. Paris (Arbeitsgruppe Nichtklassiche Strahlung der   Max-Planck-Gesellschaft)