We study fidelity decay by a uniform semiclassical approach, in the three perturbation regimes: namely, the perturbative regime, the Fermi golden rule (FGR) regime, and the Lyapunov regime. A semiclassical expression is derived for the fidelity of initial Gaussian wave packets with width of the order sqare root h (h being the effective Planck constant). The… (More)

@article{Wang2005UniformSA,
title={Uniform semiclassical approach to fidelity decay: from weak to strong perturbation.},
author={Wen-ge Wang and Baowen Li},
journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
year={2005},
volume={71 6 Pt 2},
pages={066203}
}