Measuring different types of transverse momentum correlations in the biphoton’s Fourier plane
Omar Calderón-Losada, Jefferson Flórez, Juan P. Villabona-Monsalve, Alejandra Valencia · Optics Letters · 2016
In this Letter, we present a theoretical and experimental study about the spatial correlations of paired photons generated by Type II spontaneous parametric down-conversion. In particular, we show how these correlations can be positive or negative, depending on the direction in which the far-field plane is scanned and the polarization postselected. Our results provide a straightforward way to observe different kind of correlations that complement other well-known methods to tune the spatial correlations of paired photons.