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• W3099753609 startingPage "3451" @default.
• W3099753609 abstract "In quantum/wave systems with chaotic classical analogues, wavefunctions evolve in highly complex, yet deterministic ways. A slight perturbation of the system, though, will cause the evolution to diverge from its original behaviour increasingly with time. This divergence can be measured by the fidelity, which is defined as the squared overlap of the two time evolved states. For chaotic systems, two main decay regimes of either Gaussian or exponential behaviour have been identified depending on the strength of the perturbation. For perturbation strengths intermediate between the two regimes, the fidelity displays both forms of decay. By applying a complementary combination of random matrix and semiclassical theory, a uniform approximation can be derived that covers the full range of perturbation strengths. The time dependence is entirely fixed by the density of states and the so-called transition parameter, which can be related to the phase space volume of the system and the classical action diffusion constant, respectively. The accuracy of the approximations is illustrated with the standard map." @default.
• W3099753609 created "2020-11-23" @default.
• W3099753609 creator A5004819870 @default.
• W3099753609 creator A5078870004 @default.
• W3099753609 date "2003-03-13" @default.
• W3099753609 modified "2023-10-18" @default.
• W3099753609 title "A uniform approximation for the fidelity in chaotic systems" @default.
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• W3099753609 doi "https://doi.org/10.1088/0305-4470/36/12/334" @default.
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