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Browsing by Author "Roux, FS"

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Lateral diffusion of the topological charge density in stochastic optical fields

Author: Roux, FS Date: 2010 Stochastic (i.e. random and quasi-random) optical fields may contain distributions of optical vortices that are represented by non-uniform topological charge densities. Numerical simulations are used to investigate the evolution under free-space ... Read more
Lateral phase drift of the topological charge density in stochastic optical fields

Author: Roux, FS Date: Mar 2012 The statistical distributions of optical vortices or topological charge in stochastic optical fields can be inhomogeneous in both transverse directions. Such two-dimensional inhomogeneous vortex or topological charge distributions evolve in ... Read more
Lindblad equation for the decay of entanglement due to atmospheric scintillation

Author: Roux, FS Date: Jun 2014 The quantum state for the spatial degrees of freedom of photons propagating through turbulence is analyzed. The turbulent medium is modeled by a single phase screen for weak scintillation conditions and by multiple phase screens for general ... Read more
Mimicking an amplitude damping channel for Laguerre Gaussian Modes

Author: Dudley, Angela L ; Nock, M ; Konrad, T ; Roux, FS ; Forbes, A Date: Oct 2010 An amplitude damping channel for Laguerre-Gaussian (LG) modes is presented. Experimentally the action of the channel on LG modes is in good agreement with that predicted theoretically. Read more
Modal spectrum in spontaneous parametric down-conversion with noncollinear phase matching

Author: Zhang, Y ; Roux, FS Date: Jun 2014 We investigate the effect of the down-conversion angle between the signal and idler beams in spontaneous parametric down-conversion on the bandwidth of the modal spectrum (Schmidt number) of the down-converted quantum state. For this purpose, ... Read more
One-and two-dimensional topological charge distributions in stochastic optical fields

Author: Roux, FS Date: Jun 2011 The presentation on topological charge distributions in stochastic optical fields concludes that by using a combination of speckle fields one can produce inhomogeneous vortex distributions that allow both analytical calculations and numerical ... Read more
Optical orbital angular momentum under strong scintillation

Author: Mabena, Chemist M ; Roux, FS Date: Jan 2019 The evolution of classical optical fields propagating through atmospheric turbulence is investigated under arbitrary conditions. We use the single-phase screen (SPS) method and the infinitesimal propagation equation (IPE), a multiphase screen ... Read more
Orbital-angular-momentum entanglement in turbulence

Author: Hamadou Ibrahim, A ; Roux, FS ; McLaren, M ; Konrad, T ; Forbes, A Date: Jun 2013 The turbulence-induced decay of orbital-angular-momentum (OAM) entanglement between two photons is investigated numerically and experimentally. To compare our resultswith previouswork,we simulate the turbulent atmosphere with a single phase ... Read more
Parameter dependence in the atmospheric decoherence of modal entangled photon pairs

Author: Ibrahim, AH ; Roux, FS ; Konrad, T Date: Nov 2014 When 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
Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence

Author: Hamadou Ibrahim, A ; Roux, FS ; Konrad, T Date: Aug 2011 he orbital angular momentum (OAM) state of light can potentially be used to implement higher dimensional entangled systems for quantum communication. Unfortunately, optical fibers in use today support only modes with zero OAM values. Free-space ... Read more
Projective measurements in quantum and classical optical systems

Author: Roux, FS ; Zhang, Y Date: Sep 2014 Experimental setups for the optical implementation of projective measurements in the Laguerre-Gaussian basis are discussed. Special attention is given to the case where the measurements are made with the aid of single-mode fibers that are ... Read more
Putting light in a spin

Author: Dudley, Angela L ; Rop, R ; Litvin, IA ; Lopez-Mariscal, C ; Roux, FS ; Forbes, A Date: Aug 2012 We experimentally generated superpositions of higher-order Bessel beams that possess no global orbital angular momentum (OAM), yet exhibit an angular rotation in their intensity profile as the field propagates. The digital holograms encoded ... Read more
Quantum communication and other quantum information technologies

Author: Roux, FS Date: Feb 2014 This report presents the presentation on quantum communication and other quantum information technologies. Read more
Qudit-Teleportation for photons with linear optics

Author: Goyal, SK ; Boukama-Dzoussi, PE ; Ghosh, S ; Roux, FS ; Konrad, T Date: Apr 2014 Quantum 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
Random wave fields and scintillated beams

Author: Roux, FS Date: 2009 This report present the presentation on random wave fields and scintillated beams. Read more
Robust entangled qutrit states in atmospheric turbulence

Author: Brunner, T ; Roux, FS Date: Jun 2013 The entangled quantum state of a photon pair propagating through atmospheric turbulence suffers decay of entanglement due to the scintillation it experiences. Here we investigate the robustness against this decay for different qutrit states. ... Read more
Scalar and vector vortex beams from the source

Author: Naidoo, Darryl ; Roux, FS ; Dubery, Angela L ; Litvin, Ihar ; Piccirillo, B Date: Oct 2016 We introduce a laser for generating all states on the Higher-order Poincaré sphere by coupling spin angular momentum to orbital angular momentum and we demonstrate that the OAM degeneracy of a laser may be broken. Read more
Self-healing of quantum entanglement after an obstruction

Author: McLaren, M ; Mhlanga, T ; Padgett, MJ ; Roux, FS ; Forbes, A Date: Feb 2014 Quantum 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
Simulating quantum state engineering in spontaneous parametric down-conversion using classical light

Author: Zhang, Y ; Mclaren, M ; Roux, FS ; Forbes, A Date: Jul 2014 We present a simple method of simulating the effect of the pumping process in spontaneous parametric down-conversion (SPDC) by modulating a classical laser beam with two spatial light modulators through a back projection setup. We simulate a ... Read more
Simulating spontaneous parametric down-conversion using classical light: Conference paper

Author: Zhang, Y ; McLaren, M ; Roux, FS ; Forbes, A Date: Aug 2014 We present a simple way of simulating Spontaneous parametric down-conversion (SPDC) by modulating a classical laser beam with two spatial light modulators (SLM) through a back projection setup. This system has the advantage of having very ... Read more

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Browsing by Author "Roux, FS"

Browsing by Author "Roux, FS"

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