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URL:https://murmitoyen.com/events/vanille/udem/detail/381172
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Optimal quantum control of solid state qubits – Kimberley Hall\, 
 Dalhousie
DESCRIPTION:Kimberley C. Hall\, Associate Professor and Canada Research Ch
 air in Ultrafast Science\, Department of Physics and Atmospheric Science\
 , Dalhousie University\, Halifax\, Nova Scotia\, CanadaFemtosecond pulse 
 shaping provides a flexible approach to tailoring the Hamiltonian governin
 g the interaction of light with matter.  Together with powerful adaptive 
 feedback algorithms\, this approach is now used routinely in the control o
 f a variety of physical processes.  For quantum computing applications\, 
 pulse shaping provides a means to optimize the speed and fidelity of eleme
 ntary quantum gates\, and may enable the realization of schemes for comple
 x instruction set quantum computing.  In this presentation\, I will discu
 ss our recent experiments demonstrating ultrafast quantum control of charg
 e based (exciton) qubits in semiconductor quantum dots.  Using optimal qu
 antum control techniques\, we show that pulse shaping provides a means to 
 optimize the fidelity of a C-ROT gate in single quantum dots [1\,2]\,  an
 d enables parallel single qubit gates on distant quantum dots within the l
 aser focal spot [3].  We also demonstrate adiabatic rapid passage on a su
 bpicosecond time scale in single semiconductor quantum dots\, yielding new
  insight into the role of phonons in dephasing of exciton qubits.A. Gamour
 as\, R. Mathew\, and K. C. Hall\, J. Appl. Phys. 112\, 014313 (2012).R. Ma
 thew\, C. E. Pryor\, M. E. Flatte\, and K. C. Hall\, Phys. Rev. B 84\, 205
 322 (2011).A. Gamouras\, R. Mathew\, S. Freisem\, D. G. Deppe\, and K. C. 
 Hall\, Nano Letters 13\, 4666 (2013).Site web du groupe du  Prof. HallCet
 te conférence est présentée par le RQMP Versant Nord du Département d
 e physique de l'Université de Montréal et le Département de génie phys
 ique de Polytechnique Montréal.
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