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Nonexponential decoherence and momentum subdiffusion in a quantum Levy kicked rotator.

Schomerus, Henning and Lutz, Eric (2007) Nonexponential decoherence and momentum subdiffusion in a quantum Levy kicked rotator. Physical Review Letters, 98 (26). p. 260401. ISSN 1079-7114

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Abstract

We investigate decoherence in the quantum kicked rotator (modeling cold atoms in a pulsed optical field) subjected to noise with power-law tail waiting-time distributions of variable exponent (Lévy noise). We demonstrate the existence of a regime of nonexponential decoherence where the notion of a decoherence rate is ill defined. In this regime, dynamical localization is never fully destroyed, indicating that the dynamics of the quantum system never reaches the classical limit. We show that this leads to quantum subdiffusion of the momentum, which should be observable in an experiment.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 644
Deposited By: Dr Henning Schomerus
Deposited On: 16 Oct 2007
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:14
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/644

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