title: Azimuthal distinguishability of entangled photons generated in spontaneous parametric down-conversion.
abstract: We experimentally demonstrate that paired photons generated in different sections of a down-conversion cone, when some of the interacting waves show Poynting vector walk-off, carry different spatial correlations, and therefore a different degree of spatial entanglement. This is shown to be in agreement with theoretical results. We also discuss how this azimuthal distinguishing information of the down-conversion cone is relevant for the implementation of quantum sources aimed at the generation of entanglement in other degrees of freedom, such as polarization.
authors: Clara I
authors: CI
authors: Osorio
authors: Gabriel
authors: G
authors: Molina-Terriza
authors: Blanca G
authors: BG
authors: Font
authors: Juan P
authors: JP
authors: Torres