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Detective quantum efficiency of medical x-ray image intensifiers

Author: Thirlwall, JT Date: Nov 1998 The recognition of small features of low contrast in the image recorded by an x-ray image intensifier is usually limited by photon noise. This detail-contrast perceptibility is dependent on the detective quantum efficiency (DQE) and the ... Read more
Higher-dimensional orbital-angular-momentum-based quantum key distribution with mutually unbiased bases

Author: Mafu, M ; Dudley, Angela L ; Goyal, S ; Giovannini, D ; McLaren, M ; Padgett, MJ ; Konrad, T ; Petruccione, F ; Lutkenhaus, N ; Forbes, A Date: Sep 2013 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 unbiased measurements ... 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
Photovoltaic research and development

Author: Cummings, F Date: Sep 2009 Photovoltaic (PV) is the direct conversion of sunlight into electrical energy through a solar cell. This presentation consists of an introduction to photovoltaics, the South African PV research roadmap, a look at the CSIR PV research and ... Read more
Tomography of the quantum state of photons entangled in high dimensions

Author: Agnew, M ; Leach, J ; McLaren, M ; Roux, FS ; Boyd, RW Date: Dec 2011 Systems entangled in high dimensions have recently been proposed as important tools for various quantum information protocols, such as multibit quantum key distribution and loophole-free tests of nonlocality. It is therefore important to have ... Read more

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Browsing by Subject "Photons"

Browsing by Subject "Photons"

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