Phys. Rev. Lett. 98, 260401 (2007) [4 pages]Nonexponential Decoherence and Momentum Subdiffusion in a Quantum Lévy Kicked RotatorReceived 15 November 2006; published 25 June 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.260401
DOI:
10.1103/PhysRevLett.98.260401
PACS:
03.65.Yz, 05.40.Fb, 05.45.Mt, 72.15.Rn
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