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Almost Complete local Revivals in quantum spin systems and delayed disclosure of a secret I. V. Ermakovab a Steklov Mathematical Institute of Russian Academy of Sciences, Moscow b Skolkovo Institute of Science and Technology |
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Аннотация: Revivals of initial nonequilibrium states is an ever-present concern for the theory of dynamic thermalization in many-body quantum systems. Here we consider a nonintegrable lattice of interacting spins 1/2 and show how to construct a quantum state such that a given spin 1/2 is maximally polarized initially and then exhibits an almost complete recovery of the initial polarization at a predetermined moment of time. An experimental observation of such revivals may be utilized to benchmark quantum simulators with a measurement of only one local observable. We further propose to utilize these revivals for a delayed disclosure of a secret. Язык доклада: английский |