title: Loschmidt echo in a system of interacting electrons.
abstract: We study the Loschmidt echo for a system of electrons interacting through mean-field Coulomb forces. The electron gas is modeled by a self-consistent set of hydrodynamic equations. It is observed that the quantum fidelity drops abruptly after a time that is proportional to the logarithm of the perturbation amplitude. The fidelity drop is related to the breakdown of the symmetry properties of the wave function.
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 ULP-CNRS, 23 Rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France. giovanni_manfredi@ipcms.u-strasbg.fr
authors.forename: G
authors.initials: G
authors.lastname: Manfredi
authors.forename: P-A
authors.initials: PA
authors.lastname: Hervieux