Search results for "quant-ph"

showing 10 items of 1378 documents

High Resolution Study of Some Doubly Excited Vibrational States of PH2D: The v1+v2, v2+v5, v2+v3 and v2+v6 Bands

2003

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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Unitary Approach to Vibrational Spectra of Polyatomic Molecules: Generalized Infrared Intensity Model.

1996

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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Opération de renversement du temps appliquée a un hamiltonien algébrique adapté aux molécules tétraédriques.

1998

Nous analysons la formulation de l'opération de renversement du temps (RVT) dans le cadre de l'approche algébrique des molécules tétraèdriques locales. Cette approche est basée sur les propriétés mathématiques de la chaîne de groupes U(5) <-- U(4) <-- K(4) = A(4) ^ S(4) <-- S(4) = Td (1) adaptée au système moléculaire étudié. Nous déterminons la forme générale de la transformation RVT pour une réalisation purement algébrique de tous les opérateurs, en imposant que les représentations irréductibles associées à a la chaîne (1) soient invariantes dans la symétrie RVT. Le résultat essentiel est que nous déduisons le comportement dans l'opération RVT de tous les opérateurs de notre formalisme, n…

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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Controle de l'orientation et de l'alignement moléculaire par un train d'impulsions soudaines

2005

Les recents progres technologiques dans le domaine des Lasers permettent d'envisager le controle de nombreux processus quantiques jouant un role dans une variete de problemes s'etendant de la reactivite chimique a l'information quantique. Dans ce contexte, nous nous sommes interesses au controle de l'orientation ou de l'alignement moleculaire en utilisant un train d'impulsions soudaines. Nous avons defini des etats cibles qui maximisent a la fois l'orientation ou l'alignement et sa duree dans le temps et montre comment atteindre ces etats a l'aide de strategie systematique ou optimisee.

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]0103 physical sciencesGeneral Physics and Astronomy010306 general physics01 natural sciences[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]010305 fluids & plasmas
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Influence of Unequal Oscillator Strenghts on Stimulated Raman Adiabatic Passage through Bright State

2011

The problem of the coherent control of atomic states, preparation of atoms in a stable superposition state, and atomic population transfer has attracted much attention in the last decade. One of the main motivations is associated with the rapid development of the field of quantum computing. One of the key problems of quantum information processing is the construction of given coherent superposition atomic states in a macroscopic volume. Stimulated Raman adiabatic passage (STIRAP) [1] is considered to be the most common method for atomic population transfer in quantum systems. Being analyzed in detail on various quantum systems from both theoretical and experimental points of view, this meth…

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]Bright stateStimulated Raman adiabatic passageBright state.[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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Algebraic study of pyramidal XY3 molecules in vibrationally high excited states.

2010

National audience

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]ComputingMilieux_MISCELLANEOUS[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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Study of atomic vapor layers of nanometric thickness and atom-surface interaction

2007

International audience

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]ComputingMilieux_MISCELLANEOUS[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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The Demkov-Kunike model in the coherent magneto- and photoassociation of ultracold atoms.

2009

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]Demkov-Kunike Model[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]Ultra Cold Atoms
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Generalized algebraic treatment for XY2 molecules : application to D2S.

2009

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]Molecular SpectraLie Algebra[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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Rovibrational controlled-NOT gates using optimized stimulated Raman adiabatic passage techniques and optimal control theory

2009

International audience; Implementation of quantum controlled-NOT (CNOT) gates in realistic molecular systems is studied using stimulated Raman adiabatic passage (STIRAP) techniques optimized in the time domain by genetic algorithms or coupled with optimal control theory. In the first case, with an adiabatic solution (a series of STIRAP processes) as starting point, we optimize in the time domain different parameters of the pulses to obtain a high fidelity in two realistic cases under consideration. A two-qubit CNOT gate constructed from different assignments in rovibrational states is considered in diatomic (NaCs) or polyatomic (SCCl2) molecules. The difficulty of encoding logical states in…

[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph][PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]Physics::Atomic and Molecular Clusters[PHYS.QPHY] Physics [physics]/Quantum Physics [quant-ph]
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