Loschmidt echo in a system of interacting electrons

Details Loschmidt echo in a system of interacting electrons Loschmidt echo in a system of interacting electrons

2006-10-20

arxiv.org/abs/quant-ph/0610169v1

Physics

Quantum Physics

4 pages, 6 figures, to appear in PRL

Scientific paper

10.1103/PhysRevLett.97.190404

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.

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