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fqe.openfermion_utils.determinant_to_ops

Given the alpha and beta occupation strings return, a fermion operator

which would produce that state when acting on the vacuum.

a_str (bitstring) - spatial orbital occupation by the alpha electrons

b_str (bitstring) - spatial orbital occupation by the beta electrons

inorder (bool) - flag to control creation and annihilation order

(FermionOperator)