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Decoherence and Noise in Loschmidt Echo Experiments

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Alicki R., Miklaszewski W., Pogorzelska M.
Acta Physica Polonica A
|
2006
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vol. 109
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issue 1
121-129
EN
We discuss some recent results concerning the decoherence in controlled quantum open systems within the mathematical setting corresponding to motion reversal experiments (the Loschmidt echo). We compare the case of randomly chosen sequence of unitary dynamical maps with the case of a constant dynamics corresponding to a classically chaotic evolution. The interplay between chaos and decoherence is illustrated by the new numerical results on the quantum Arnold cat map perturbed by a measurement process. Open problems related to the simple operational characterization of the decoherence strength are discussed.
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