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Finite-volume and thermodynamic-limit lower bounds for the coherently driven Bose--Hubbard model via the Lieb--Yamazaki method
We derive rigorous lower bounds on the ground-state energy of the coherently driven Bose--Hubbard model using a Lieb--Yamazaki positive-operator decomposition. The resulting quadratic bounding Hamiltonian is diagonalized by displacement and Bogoliubov transformations, yielding explicit stability con
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