State Reduction for Correlated Photons and Eigenstates of Unitarily and Non-unitarily Displaced Number Operator
A. Lukš, Vlasta Peřinová, J. Křepelka · Journal of Modern Optics · 1994
The number-quadrature minimum-uncertainty states after rotation and displacement emerge in the parametric down-conversion followed by photon number measurement in the idler mode when the coherent state inputs. Again, the state generated in the signal mode by the reduction is described by the principally measurable quantum-statistical tools.