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What methods can I use to find the minimum of a tranverse field Ising model?

I am trying to solve for the minimum of the hamiltonian of the form: $$ H = \sum_{i,j} J_{ij}q(i)q(j) + g_i\sum_i x(i) $$ where q(i) is the operator (I + z(i))/2 and z(i) and x(i) are pauli operators ...
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