Yaseera Ismail

Yaseera Ismail
University of KwaZulu-Natal | ukzn · School of Chemistry and Physics/Quantum Research Group

Doctor of Philosophy

About

19
Publications
2,627
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111
Citations
Introduction
I specialise in the development of quantum technologies, particularly in the field of quantum information science. I am an experimentalist developing quantum optical tools for the advancement of free-space long-range secure quantum communication.
Additional affiliations
November 2020 - present
University of KwaZulu-Natal
Position
  • Senior Lecturer
Education
February 2005 - December 2008
University of KwaZulu-Natal
Field of study
  • Physics

Publications

Publications (19)
Preprint
Full-text available
This work presents results of property researches of fabricated samples of silica few-mode optical fiber (FMF) with induced chirality under twisting 10 and 66 revolutions per meter, core diameter 11 µm, typical “telecommunication” cladding diameter 125 µm and improved height of quasi-step refractive index profile. Proposed FMF supports 4 guided mod...
Article
Full-text available
Stimulated parametric down-conversion is a nonlinear optical process that can be used for phase conjugation and frequency conversion of an optical field. A precise description of the outgoing stimulated field has been developed for the case where the input pump and seed fields are coherent. However, partially coherent beams can have interesting and...
Article
Citation: Bourdine, A.V.; Barashkin, A.Y.; Burdin, V.A.; Dashkov, M.V.; Demidov, V.V.; Dukelskii, K.V.; Evtushenko, A.S.; Ismail, Y.; Khokhlov, A.V.; Kuznetsov, A.A.; et al.
Article
The development of a quantum network relies on the advances of hybrid systems which include ground-to-ground communication. However, the atmospheric turbulence of the environment poses a severe challenge to the optical quantum link. In this paper, we outline a theoretical and experimental investigation of the influence of atmospheric turbulence on...
Article
In the paper, a spirally filled solid core chalcogenide-based photonic crystal fibre is proposed, which is engineered to obtain a flattened broad anomalous dispersion profile. The spectrum spanning in the wavelength region from 1.5 to 3.6 μm was achieved by pumping hyperbolic secant pulses with a peak power of 350 W and 85 fs pulse duration, at a w...
Preprint
Full-text available
The development of a quantum network relies on the advances of hybrid systems which includes ground to ground communication. However, the atmospheric turbulence of the environment poses a severe challenge to the optical quantum link. In this paper, we outline a theoretical and experimental investigation of the influence of atmospheric turbulence on...
Preprint
Full-text available
Metamaterials are artificially engineered periodic structures with exceptional optical properties that are not found in conventional materials. However, this definition of metamaterials can be extended if we introduce a quantum degree of freedom by adding some quantum elements (e.g quantum dots, cold atoms, Josephson junctions, molecules). Quantum...
Article
Full-text available
Point to point communication in free-space is severely dependent upon the alignment of the transmitter and receiver devices. The simplest low cost method for the alignment is achieved by utilising two geographical coordinates and an electronic compass. However, some regions of the Earth have a strong magnetic deviation that can introduce large erro...
Article
Full-text available
Free-space quantum communication technology has made significant advancements over the years. However, to achieve a global quantum network there are still obstacles to overcome. To date, free-space quantum communication channels have been faced with challenges related to losses in the quantum channel, security, and low data rates. Classical machine...
Conference Paper
Full-text available
Free-space quantum communication faces challenges related to losses in the transmission channel. Machine learning is resourceful for monitoring these channels. Here, supervised learning was used to predict the atmospheric strength of the channel.
Conference Paper
Metamaterials have open up new ways of manipulating and controlling light, making them a useful material in quantum communication. We experimentally tune a plasmonic metasurface partial polarizer in the quantum regime using an external laser.
Article
Full-text available
The generation of two photon fields, to date, has been demonstrated utilizing a fully coherent pump beam. In this paper we demonstrate, the theoretical and experimental generation of polarization entangled single photon pairs by varying the spatial coherence of the pump beam. The effect of the pump beam spatial coherence on the visibility of a pola...
Article
Full-text available
Free-space optical communication is hindered by turbulence resulting in spatial modal dispersion of the optical beam. Here we mimic in the laboratory the far-field turbulence effects on entangled photons in the polarization basis. We make use of a diffractive optical element to simulate turbulence distortions and measure the entanglement as a funct...
Article
We propose a 2-dimensional method for Bessel Gaussian beam azimuthal and radial decomposition using digital holograms. We illustrate the reconstruction of a Bessel Gaussian beam after encountering an obstruction. From the measured decomposition we show the reconstruction of the amplitude, phase and azimuthal index of the field with high degree of a...
Article
Full-text available
We propose a simple method for the detection of Bessel beams with arbitrary radial and azimuthal indices, and then demonstrate it in an all-digital setup with a spatial light modulator. We confirm that the fidelity of the detection method is very high, with modal cross-talk below 5%, even for high orbital angular momentum carrying fields with long...
Article
Full-text available
We present a method for generating higher-order Bessel beams with z-dependent cone angles. Such fields, if engineered correctly, are shape invariant during propagation and thus do not suffer from a transition from a Bessel-shaped intensity profile in the near field to an annular ring in the far field. We demonstrate the production of such fields in...
Article
Full-text available
As in the case of zero-order Bessel beam being produced by illuminating an axicon with a Gaussian beam, higher-order Bessel beams are generated by substituting the Gaussian beam with a Laguerre Gaussian (LG) beam. These beams hold similar properties to zero-order Bessel beams except they carry orbital angular momentum (OAM). They also undergo an ab...

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Projects

Project (1)
Project
The project addresses the photonics thematic area of the BRICS call focusing on the following two key areas • High speed data transmission and processing • Photonic quantum technologies. The emphasis is to develop QKD techniques for secure communication leading to high speed optical fibre and free-space communication including satellite based communication.