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

Research output: Contribution to journalJournal articlepeer-review

Published
<mark>Journal publication date</mark>25/06/2007
<mark>Journal</mark>Physical review letters
Issue number26
Volume98
Pages (from-to)260401
Publication StatusPublished
<mark>Original language</mark>English

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.