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Module to remove two qubits from the problem space using conservation
of electron number and conservation of electron spin. As described in arXiv:1701.08213 and Phys. Rev. X 6, 031007.
edit_hamiltonian_for_spin(...): Removes the Z terms acting on the orbital from the Hamiltonian.
remove_indices(...): Returns the symbolic operator from which the operator with the specified
symmetry_conserving_bravyi_kitaev(...): Returns the qubit Hamiltonian for the fermionic Hamiltonian