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Average diagonal entropy in non-equilibrium isolated quantum systems

The diagonal entropy was introduced as a good entropy candidate especially for isolated quantum systems out of equilibrium. Here we present an analytical calculation of the average diagonal entropy for systems undergoing unitary evolution and an external perturbation in the form of a cyclic quench. We compare our analytical findings with numerical simulations of various many-body quantum systems. Our calculations elucidate various heuristic relations proposed recently in the literature.

preprint2016arXivOpen access
Olivier GiraudIgnacio García-Mata
quant-ph
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Open access2 authors1 topic
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Olivier GiraudIgnacio García-Mata

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