We use retrodictive quantum theory to analyse two-photon quantum imaging systems. The formalism is particularly suitable for calculating conditional probability distributions.
An erratum to this article can be found at http://dx.doi.org/10.1140/epjd/e2004-00042-2PACS:
42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements - 03.65.Ta Foundations of quantum mechanics; measurement theory