Article (Scientific journals)
Fidelity for kicked atoms with gravity near a quantum resonance
Dubertrand, Rémy; Guarneri, I; Wimberger, S
2012In Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 85, p. 036205
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Keywords :
Semiclassical methods; Quantum chaos
Abstract :
[en] Kicked atoms under a constant Stark or gravity field are investigated for experimental setups with cold and ultracold atoms. The parametric stability of the quantum dynamics is studied using the fidelity. In the case of a quantum resonance, it is shown that the behavior of the fidelity depends on arithmetic properties of the gravity parameter. Close to a quantum resonance, the long-time asymptotics of the fidelity is studied by means of a pseudoclassical approximation introduced by Fishman et al. [J. Stat. Phys. 110, 911 (2003)]. The long-time decay of fidelity arises from the tunneling out of pseudoclassical stable islands, and a simple ansatz is proposed which satisfactorily reproduces the main features observed in numerical simulations.
Disciplines :
Physics
Author, co-author :
Dubertrand, Rémy ;  Université de Liège - ULiège > Département de physique > Optique quantique
Guarneri, I
Wimberger, S
Language :
English
Title :
Fidelity for kicked atoms with gravity near a quantum resonance
Publication date :
March 2012
Journal title :
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
ISSN :
1539-3755
eISSN :
1550-2376
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
85
Pages :
036205
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 February 2015

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