IFIMAR   20926
INSTITUTO DE INVESTIGACIONES FISICAS DE MAR DEL PLATA
Unidad Ejecutora - UE
artículos
Título:
Loschmidt echo in quantum maps: the elusive nature of the Lyapunov regime
Autor/es:
I. GARCIA-MATA; D. A. WISNIACKI
Revista:
JOURNAL OF PHYSICS. A - MATHEMATICAL AND GENERAL
Editorial:
IOP
Referencias:
Año: 2011 vol. 44 p. 315101 - 315101
ISSN:
0305-4470
Resumen:
The Loschmidt echo (LE) is a measure of the stability and reversibility of quantum evolution under perturbations of the Hamiltonian. One of the expected and most relevant characteristics of this quantity for chaotic systems is an exponential decay with a perturbation-independent decay rate given by the classical Lyapunov exponent. However, a non-uniform decay?instead of the Lyapunov regime?has been reported in several systems. In this work, we find an analytical semiclassical expression for the averaged fidelity amplitude that can be directly related to the anomalous?unexpected?behaviour of the LE.
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