Finite-volume and thermodynamic-limit lower bounds for the coherently driven Bose--Hubbard model via the Lieb--Yamazaki method

Abstract

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 conditions and finite-volume bounds in arbitrary dimension. We establish the thermodynamic-limit energy density and characterize the excitation spectrum of the bounding Hamiltonian. We also derive its Gaussian-state observables, including filling, number fluctuations, and second-order correlations, and identify regimes of antibunching and sub-Poissonian statistics. Numerical calculations assess the tightness of the bounds across representative parameter regimes.