Shortcut to Adiabaticity in the Lipkin-Meshkov-Glick Model

Abstract

We study transitionless quantum driving in an infinite-range many-body system described by the Lipkin-Meshkov-Glick model. Despite the correlation length being always infinite the closing of the gap at the critical point makes the driving Hamiltonian of increasing complexity also in this case. To this aim we develop a hybrid strategy combining shortcut to adiabaticity and optimal control that allows us to achieve remarkably good performance in suppressing the defect production across the phase transition.

4+3 pages, 4+1 figures. Accepted for publication in Phys. Rev. Lett

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