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Browsing by Author "Konrad, T"

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  • Dudley, Angela L; Nock, M; Konrad, T; Forbes, A (IOP Institute of Pyhsics, 2010-03)
    Since the pioneering work on the entanglement of the orbital angular momentum (OAM) states of light, much attention has been devoted to the subject, with particular attention into the quantum aspects of information processing ...
  • Dudley, Angela L; Nock, M; Konrad, T; Roux, FS; Forbes, A (Optical Society of America, 2010-10)
    In this article, the authors present an amplitude damping channel for Laguerre-Gaussian modes. The channel is tested experimentally for a Laguerre-Gaussian mode, having an azimuthal index l = 1, illustrating that it decays ...
  • Dudley, Angela L; Nock, M; Konrad, T; Roux, F; Forbes, A (South African Institute of Physics, 2010-09)
    An interferometer, mimicking an amplitude damping channel for vortex modes, is presented. Experimentally the action of the channel is in good agreement with that predicted theoretically. Since we can characterize the action ...
  • Dudley, Angela L; Mafu, M; Goyal, S; Giovannini, D; McLaren, M; Konrad, T; Padgett, MJ; Petruccione, F; Lutkenhaus, N; Forbes, A (2013-07)
    We encode mutually unbiased bases (MUBs) using the higher-dimensional orbital angular momentum (OAM) degree of freedom associated with optical fields. We illustrate how these states are encoded with the use of a spatial ...
  • Zhang, YI; Roux, FS; Konrad, T; Agnew, M; Leach, J; Forbes, A (American Association for the Advancement of Science, 2016-02)
    Many protocols in quantum science, for example, linear optical quantum computing, require access to large-scale entangled quantum states. Such systems can be realized through many-particle qubits, but this approach often ...
  • Mafu, M; Dudley, Angela L; Goyal, S; Giovannini, D; McLaren, M; Padgett, MJ; Konrad, T; Petruccione, F; Lutkenhaus, N; Forbes, A (American Physical Society, 2013-09)
    We present an experimental study of higher-dimensional quantum key distribution protocols based on mutually unbiased bases, implemented by means of photons carrying orbital angular momentum. We perform (d + 1) mutually ...
  • Choudhary, SK; Konrad, T; Uys, H (American Physical Society, 2013-01)
    Unsharp positive operator-valued measurements allow a variety of measurement applications which minimally disrupt the state of the quantum system. Experimental schemes are proposed for implementing unsharp measurements on ...
  • Goyal, SK; Roux, FS; Forbes, A; Konrad, T (American Physical Society, 2013-06)
    We present an implementation scheme for a quantum walk in the orbital angular momentum space of a laser beam. The scheme makes use of a ring interferometer, containing a quarter-wave plate and a q plate. This setup enables ...
  • Hamadou Ibrahim, A; Roux, FS; McLaren, M; Forbes, A; Konrad, T (2013-06)
    This is a power point presentation questioning the feasablility of free space quantum communication with the OAM state of light. Presented June 2013
  • Konrad, T; Uys, H (American Physical Society, 2012-01)
    Unsharp measurements allow the estimation and tracking of quantum wave functions in real time with minimal disruption of the dynamics. Here we demonstrate that high-fidelity state monitoring, and hence quantum control, is ...
  • Dudley, Angela L; Nock, M; Konrad, T; Roux, FS; Forbes, A (Optical Society of America, 2010-10)
    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.
  • Hamadou Ibrahim, A; Roux, FS; McLaren, M; Konrad, T; Forbes, A (American Physical Society, 2013-06)
    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 ...
  • Ibrahim, AH; Roux, FS; Konrad, T (American Physical Society, 2014-11)
    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. ...
  • Hamadou Ibrahim, A; Roux, FS; Konrad, T (SPIE, 2011-08)
    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 ...
  • Bassa, H; Goyal, SK; Choudhary, SK; Uys, H; Diósi, L; Konrad, T (American Physical Society, 2015-09)
    The authors utilize a discrete (sequential) measurement protocol to investigate quantum process tomography of a single two-level quantum system, with an unknown initial state, undergoing Rabi oscillations. The ignorance ...
  • Goyal, SK; Boukama-Dzoussi, PE; Ghosh, S; Roux, FS; Konrad, T (Nature Publishing Group, 2014-04)
    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 ...
  • Hamadou Ibrahim, A; Roux, FS; Konrad, T (2011-07)
    This study focusses on short distance free-space communication, long distance free-space communication, as well as the challenges for free-space communication. The phase screen method is discussed, and the question "how ...