Figure 1
From: Popper’s conjecture with angular slits and twisted light
(a) The linear case (spatial/momentum) for which the momentum spread is measured. The dashed black line represents a single photon which is incident on a physical linear slit and a linear diffraction pattern is observed, from which a spread in momentum is measured. (b) The red rings represents two entangled photons (photon A and B) being generated from a source and propagating (to the left and right respectively), whereby one photon is incident on the linear slit while the momentum of the other photon is measured. (c) The angular case (angular position/OAM) for which the OAM spread is measured. The dashed black line represents a single photon which is incident on a physical angular slit and an angular diffraction pattern is observed from which a spread in momentum is measured by decomposing the pattern into orbital angular momentum (OAM) states. (d) The angular position/OAM case with entangled photons, for which the spread in OAM is measured. Whereby one photon is incident on the angular slit while the OAM of the other photon is measured.
