TY - JOUR

T1 - Nonexponential decoherence and momentum subdiffusion in a quantum Levy kicked rotator.

AU - Schomerus, Henning

AU - Lutz, Eric

PY - 2007/6/25

Y1 - 2007/6/25

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.98.260401

DO - 10.1103/PhysRevLett.98.260401

M3 - Journal article

VL - 98

SP - 260401

JO - Physical review letters

JF - Physical review letters

SN - 1079-7114

IS - 26

ER -