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Browsing by Author "Uys, H"

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  • Du Plessis, A; Strydom, CA; Uys, H; Botha, L; Roberts, T; Dlamini, TH (CSIR, 2010-09)
    Femtosecond laser control of chemical reactions is made possible through the use of pulse-shaping techniques coupled to a learning algorithm feedback loop – teaching the laser pulse to control the chemical reaction. This ...
  • Du Plessis, A; Strydom, CA; Uys, H; Botha, L; Roberts, T; Dlamini, TH (CSIR, 2010-08-31)
    Femtosecond laser control of chemical reactions is made possible through the use of pulse-shaping techniques coupled to a learning algorithm feedback loop – teaching the laser pulse to control the chemical reaction. This ...
  • Du Plessis, A; Strydom, CA; Uys, H; Hendriks, A; Botha, GN; Botha, LR (2011-07)
    Results from experiments aimed at bimolecular chemical reaction control of CO and H2 at room temperature and pressure, without any catalyst, using shaped femtosecond laser pulses are presented. A stable reaction product ...
  • Green, T; Uys, H; Biercuk, MJ (American Physical Society, 2012-07)
    Treating the effects of a time-dependent classical dephasing environment during quantum logic operations poses a theoretical challenge, as the application of noncommuting control operations gives rise to both dephasing and ...
  • 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 ...
  • Botha, L; Du Plessis, A; Uys, H; de Clercq, L (CSIR, 2010-09-01)
    Coherent control of quantum dynamics in optical, molecular and biological systems is a rapidly advancing field with many possible applications. This field of study was originally motivated by the goal of steering photoreactions ...
  • 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 ...
  • 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 ...
  • Uys, H; Biercuk, M; Van Devender, AP; Bollinger, JJ (SAIP 2010, 2010-09)
    The authors study pulse sequences that dynamically decouple 9Be+ ions from their decohering environment. The noise environment the ions see is artificially synthesized to emulate a variety of physical systems. By incorporating ...
  • Botha, N; Botha, L; Du Plessis, A; Uys, H; Schoewer, H (2010-10)
    The design of the pulse shaping setup as well as factors taken into account in choosing a specific setup will be discussed. We investigate the generation of simple shaped pulses to test our pulse shaper setup. Difference ...
  • Uys, H; Amini, JM; Wesenberg, JH; Seidelin, S; Britton, J; Bollinger, JJ; Leibfried, D; Ospelkaus, C; Van Deventer, AP; Wineland, DJ (SAIP 2010, 2010-09)
    The design, fabrication and preliminary testing of a chipscale, multi-zone, surface electrode ion trap is reported. The modular design and fabrication techniques used are anticipated to advance scalability of ion trap ...
  • de Clercq, L; Botha, L; Uys, H; Du Plessis, A; Rohwer, E (2010-09)
    Coherent control of the upper vibrational level populations in the electronic ground state of a polyatomic molecule was simulated. Results indicate that selective excitation of a specific upper state level is possible
  • De Clercq, L; Botha, L; Uys, H; Du Plessis, A; Rohwer, E (SAIP 2010, 2010-09)
    Coherent control of the upper vibrational level populations in the electronic ground state of a polyatomic molecule was simulated. Results indicate that selective excitation of a specific upper state level is possible.
  • Sawyer, BC; Britton, JW; Keith, AC; Joseph Wang, CCJ; Freericks, JK; Uys, H; Biercuk, MJ; Bollinger, JJ (American Physical Society, 2012-05)
    We demonstrate spectroscopy and thermometry of individual motional modes in a mesoscopic 2D ion array using entanglement-induced decoherence as a method of transduction. Our system is a 400 µm-diameter planar crystal of ...
  • Madigoe, RJ; Botha, LR; Uys, H; Rohwer, EG; Smit, A (2012-10)
    According to a theoretical analysis, the control landscape of many quantum control problems has a very favourable topology regardless of the detailed nature of the Hamiltonian, provided that one has full control of the ...