Author:Ibrahim, AH; Roux, FS; Konrad, TDate:Nov 2014When a pair of photons that are entangled in terms of their transverse modes, such as an orbital angular momentum (OAM) basis, propagates through atmospheric turbulence, the scintillation causes a decay of the entanglement. Here, we use ...Read more
Author:Chaibi, A; Mafusire, C; Forbes, ADate:Sep 2013The orbital angular momentum of light has been suggested as a means of information transfer over free-space, yet the detected optical vortex is known to be sensitive to perturbation. Such effects have been studied theoretically, in particular ...Read more
Author:Dudley, Angela L; Litvin, IA; Forbes, ADate:Mar 2012In this work we derive expressions for the orbital angular momentum (OAM) density of light, for both symmetric and nonsymmetric optical fields, that allow a direct comparison between theory and experiment. We present a simple method for ...Read more
Author:Dudley, Angela L; Schulze, C; Litvin, I; Duparré, M; Forbes, ADate:Aug 2013Although many techniques are efficient at measuring optical orbital angular momentum (OAM), they do not allow one to obtain a quantitative measurement for the OAM density across an optical field and instead only measure its global OAM. Numerous ...Read more
Author:Goyal, SK; Boukama-Dzoussi, PE; Ghosh, S; Roux, FS; Konrad, TDate:Apr 2014Quantum teleportation, the transfer of the state of one quantum system to another without direct interaction between both systems, is an important way to transmit information encoded in quantum states and to generate quantum correlations ...Read more
Author:Zhang, Y; Roux, FX; McLaren, M; Forbes, ADate:2014The radial degrees of freedom of the biphoton states that are produced in spontaneous parametric down-conversion (SPDC) in the Laguerre-Gaussian (LG) basis are investigated, theoretically and experimentally. We calculated the theoretical ...Read more
Author:McLaren, M; Mhlanga, T; Padgett, MJ; Roux, FS; Forbes, ADate:Feb 2014Quantum entanglement between photon pairs is fragile and can easily be masked by losses in transmission path and noise in the detection system. When observing the quantum entanglement between the spatial states of photon pairs produced by ...Read more
Author:Dudley, Angela LDate:Jan 2012The work presented in this thesis is centred on the generation of superimposed optical fields which each carry orbital angular momentum (OAM) and the development of OAM measurement techniques. Optical fields which carry OAM have found ...Read more
Author:McLaren, M; Romero, J; Padgett, MJ; Roux, FS; Forbes, ADate:Sep 2013In this paper we consider geometrical two-photon optics of Bessel-Gaussian modes generated in spontaneous parametric down-conversion of a Gaussian pump beam. We provide a general theoretical expression for the orbital angular momentum (OAM) ...Read more
Author:Nape, I; Mashaba, Nikiwe P; Mphuthi, N; Jayakumar, S; Bhattacharya, S; Forbes, AndrewDate:Mar 2021Vector beams are inhomogeneously polarized optical fields with nonseparable, quantum-like correlations between their polarization and spatial components, and hold tremendous promise for classical and quantum communication across various ...Read more