Browsing Research Publications/Outputs by Author "Padgett, MJ"

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Characterization of high-dimensional entangled systems via mutually unbiased measurements

Author: Giovannini, D ; Romero, J ; Leach, J ; Dudley, Angela L ; Forbes, A ; Padgett, MJ Date: Apr 2013 Mutually unbiased bases (MUBs) play a key role in many protocols in quantum science, such as quantum key distribution. However, defining MUBs for arbitrary high-dimensional systems is theoretically difficult, and measurements in such bases ... Read more
Encoding mutually unbiased bases in orbital angular momentum for quantum key distribution

Author: Dudley, Angela L ; Mafu, M ; Goyal, S ; Giovannini, D ; McLaren, M ; Konrad, T ; Padgett, MJ ; Petruccione, F ; Lutkenhaus, N ; Forbes, A Date: Jul 2013 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 light modulator (SLM). ... Read more
Entangled Bessel-Gaussian beams

Author: McLaren, M ; Agnew, M ; Leach, J ; Roux, FS ; Padgett, MJ ; Boyd, RW ; Forbes, A Date: Oct 2012 Orbital angular momentum (OAM) entanglement is investigated in the Bessel-Gaussian (BG) basis. Having a readily adjustable radial scale, BG modes provide an alternative basis for OAM entanglement over Laguerre-Gaussian modes. We show that 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
Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam

Author: Romero, J ; Giovannini, D ; McLaren, MG ; Galvez, EJ ; Forbes, A ; Padgett, MJ Date: Aug 2012 We report orbital angular momentum (OAM) and angle correlations between signal and idler photons observed when the nonlinear crystal used in spontaneous parametric down-conversion is illuminated by a non-fundamental Gaussian pump beam. We ... Read more
Quantum entanglement with a hermite-gaussian pump; poster

Author: McLaren, M ; Romero, J ; Giovannini, D ; Galvez, EJ ; Padgett, MJ ; Forbes, A Date: Jul 2013 Typically, a Gaussian mode is used to pump a non-linear crystal to produce pairs of entangled photons. We demonstrate orbital angular momentum (OAM) entanglement when a non-fundamental mode is used to pump a non-linear crystal. An approximation ... Read more
Reconstruction of high-dimensional states entangled in orbital angular momentum using mutually unbiased measurements

Author: Giovannini, D ; Romero, J ; Leach, J ; Dudley, Angela L ; Forbes, A ; Padgett, MJ Date: Jun 2013 Efficient quantum state reconstruction of a high-dimensional multi-partite quantum system can be performed by considering mutually unbiased measurements of the individual parts. We illustrate this approach experimentally using a bipartite ... Read more
Robust interferometer for the routing of light beams carrying orbital angular momentum

Author: Lavery, MPJ ; Dudley, Angela L ; Forbes, A ; Courtial, J ; Padgett, MJ Date: Sep 2011 The authors have developed an interferometer requiring only minimal angular alignment for the routing of beams carrying orbital angular momentum. The Mach–Zehnder interferometer contains a Dove prism in each arm where each has a mirror plane ... 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
Two-photon optics of Bessel-Gaussian modes

Author: McLaren, M ; Romero, J ; Padgett, MJ ; Roux, FS ; Forbes, A Date: Sep 2013 In 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

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Browsing Research Publications/Outputs by Author "Padgett, MJ"

Browsing Research Publications/Outputs by Author "Padgett, MJ"

Browse

All of ResearchSpace

This Community

Quick Links

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General Enquiries

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