Quantum chaos of a mixed, open system of kicked cold atoms

TL;DR

This paper investigates the quantum and classical behaviors of cold atoms subjected to a Gaussian potential kicks, revealing how quantum fidelity oscillates with phase space structures and highlighting differences in scattering dynamics.

Contribution

It introduces a study of quantum chaos in a mixed, open system of kicked cold atoms, connecting classical phase space structures with quantum fidelity oscillations and experimental realizability.

Findings

Fidelity exhibits oscillations influenced by phase space structures.

Classical and quantum dynamics diverge in time-dependent scattering.

Classical phase space structures determine quasi-energy families.

Abstract

The quantum and classical dynamics of particles kicked by a gaussian attractive potential are studied. Classically, it is an open mixed system (the motion in some parts of the phase space is chaotic, and in some parts it is regular). The fidelity (Lochshmidt echo) is found to exhibit oscillations that can be determined from classical considerations but are sensitive to phase space structures that are smaller than Planck's constant. Families of quasi-energies are determined from classical phase space structures. Substantial differences between the classical and quantum dynamics are found for time dependent scattering. It is argued that the system can be experimentally realized by cold atoms kicked by a gaussian light beam.