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- W2169581609 abstract "We address the time decay of the Loschmidt echo, measuring sensitivity of quantum dynamics to small Hamiltonian perturbations, in one-dimensional integrable systems. Using semiclassical analysis, we show that the Loschmidt echo may exhibit a well-pronounced regime of exponential decay, alike the one typically observed in quantum systems whose dynamics is chaotic in the classical limit. We derive an explicit formula for the exponential decay rate in terms of the spectral properties of the unperturbed and perturbed Hamilton operators and the initial state. In particular, we show that the decay rate, unlike in the case of the chaotic dynamics, is directly proportional to the strength of the Hamiltonian perturbation. Finally, we compare our analytical predictions against the results of a numerical computation of the Loschmidt echo for a quantum particle moving inside a one-dimensional box with Dirichlet-Robin boundary conditions, and find the two in good agreement." @default.
- W2169581609 created "2016-06-24" @default.
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- W2169581609 date "2014-02-18" @default.
- W2169581609 modified "2023-10-16" @default.
- W2169581609 title "Origin of the exponential decay of the Loschmidt echo in integrable systems" @default.
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- W2169581609 doi "https://doi.org/10.1103/physreve.89.022915" @default.
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