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Theses
Information Quantique par Passage Adiabatique : Portes Quantiques et Décohérence
Information Quantique par Passage Adiabatique : Portes Quantiques et Décohérence
Abstract : The first part of this thesis is about adiabatic quantum processes designed for
the implementation of quantum logic gates, the elementary components of quantum
computers, by the interaction of pulsed laser fields with atoms. The adiabatic
methods allow robust processes, i.e. which are not sensitive to the fluctuations
of experimental parameters. The processes described in this thesis only require
accurate control of the polarisations and the relative static phases of the
laser fields. These processes allow the implementation of a universal set of
quantum gates, which make possible the implementation of all the other quantum
gates by combinations.
The second part of this thesis concerns the effects of dephasing decoherence in
adiabatic passage. The transition probability formula of a two level system with
dephasing is established. This formula is valid in all regimes, from diabatic to
adiabatic, and can be used to derive the parameters of elliptic trajectories
that optimise the population transfer.
the implementation of quantum logic gates, the elementary components of quantum
computers, by the interaction of pulsed laser fields with atoms. The adiabatic
methods allow robust processes, i.e. which are not sensitive to the fluctuations
of experimental parameters. The processes described in this thesis only require
accurate control of the polarisations and the relative static phases of the
laser fields. These processes allow the implementation of a universal set of
quantum gates, which make possible the implementation of all the other quantum
gates by combinations.
The second part of this thesis concerns the effects of dephasing decoherence in
adiabatic passage. The transition probability formula of a two level system with
dephasing is established. This formula is valid in all regimes, from diabatic to
adiabatic, and can be used to derive the parameters of elliptic trajectories
that optimise the population transfer.
Cited literature [99 references]
https://tel.archives-ouvertes.fr/tel-00180890
Contributor : Xavier Lacour <>
Submitted on : Monday, October 22, 2007 - 12:45:39 PM
Last modification on : Friday, June 8, 2018 - 2:50:14 PM
Long-term archiving on: : Monday, September 24, 2012 - 2:15:18 PM
Contributor : Xavier Lacour <>
Submitted on : Monday, October 22, 2007 - 12:45:39 PM
Last modification on : Friday, June 8, 2018 - 2:50:14 PM
Long-term archiving on: : Monday, September 24, 2012 - 2:15:18 PM