title: Einstein-Podolsky-Rosen paradox in twin images.
abstract: Spatially entangled twin photons provide both promising resources for modern quantum information protocols, because of the high dimensionality of transverse entanglement, and a test of the Einstein-Podolsky-Rosen paradox in its original form of position versus impulsion. Usually, photons in temporal coincidence are selected and their positions recorded, resulting in a priori assumptions on their spatiotemporal behavior. In this Letter, we record, on two separate electron-multiplying charge coupled devices cameras, twin images of the entire flux of spontaneous down-conversion. This ensures a strict equivalence between the subsystems corresponding to the detection of either position (image or near-field plane) or momentum (Fourier or far-field plane). We report the highest degree of paradox ever reported and show that this degree corresponds to the number of independent degrees of freedom, or resolution cells, of the images.
authors.affiliation: Département d'Optique, Institut FEMTO-ST, Université de Franche-Comté, CNRS, 25000 Besançon, France.
authors.forename: Paul-Antoine
authors.initials: PA
authors.lastname: Moreau
authors.affiliation: Département d'Optique, Institut FEMTO-ST, Université de Franche-Comté, CNRS, 25000 Besançon, France.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Devaux
authors.affiliation: Département d'Optique, Institut FEMTO-ST, Université de Franche-Comté, CNRS, 25000 Besançon, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Lantz
mesh_terms: D005583:Fourier Analysis; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008962:Models, Theoretical; D017785:Photons; D011789:Quantum Theory