Search results for "Quantum"
showing 10 items of 9714 documents
Application de la théorie des perturbations canoniques à la dynamique moléculaire
2003
Laser control of photoinduced dynamics : Quantum gates
2006
Controle de processus quantiques par impulsions laser intenses : transfert sélectif de population, alignement moléculaire et information quantique
2005
KAM techniques and resonances
2004
International audience
Monodromie Hamiltonienne: de la spectroscopie à l'optique non-linéaire
2010
International audience
Coherent population trapping effect in sub-micron thin Rb-vapor layer.
2006
International audience
Quantum dynamics study of the D$^+$ + H$_2$ reaction at low temperature
2013
International audience; For chemistry networks describing the reactions for the early universe and especially for accurate models of the enrichment of deuterated molecules observed, we need to know in detail many state-to-state rate coefficients. For instance, Glover and Abel [1] modeled the chemistry of H2 and HD primordial gas using a chemical network consisting of 115 reactions between 16 species. Today most of the rate coefficients of interesting reactions are still unknown or with a poor accuracy. For example, the uncertainty about the rate coefficient for the reaction D+ + H2 --> HD + H+ directly affects model predictions for the HD abundance and thereby the cooling rate of the primor…
Optimal control of spin-systems: Applications to Nuclear Magnetic Resonance and Quantum Information
2016
The goal of this thesis is to apply the optimal control theory to Nuclear Magnetic Resonance and Quantum Information. In a first step, we introduce the different topics and the dynamics of the analyzed systems. We give the necessary tools to use the Pontryagin Maximum Principle, and also an optimization algorithm, namely GRAPE. The first work is an application of the PMP to the control of a three-spin chain with unequal couplings. We continue with the study of a classical problem called "the tennis racket effect", which is a non-linear phenomenon occuring during the free rotation of a three-dimensional rigid body. We use the results in the following chapter to determine some control laws fo…
Analysis of highly excited 'hot' bands in the SO2 molecule: ν2 + 3ν3 - ν2 and 2ν1 + ν2 + ν3 - ν2
2010
International audience; We set up a variational procedure of assignments of transitions and we applied it to the analysis very weak 'hot' bands, v(2) + 3v(3) - v(2) and 2v(1) + v(2) + v(3) - v(2), of the SO2 molecule. As the first step of the study, the 'cold' bands, 3v(3) and 2v(1) + v(3), are re-analysed and transitions belonging to those bands are assigned up to the values of quantum numbers J(max.) = 60, K-a(max.) = 19, and J(max.) = 69, K-a(max.) = 20 for the bands 3v(3) and 2v(1) + v(3), respectively. After 'cleaning' the experimental spectrum from transitions belonging to the 3v(3) and 2v(1) + v(3) bands, a variational procedure was used that allowed us to assign 230 and 115 transiti…
Quantum Cellular Automata: a Short Overview of Molecular Problem
2018
International audience