I am trying to generate a Hamiltonian for the H2O molecule using openfermion-pyscf.
As far as I understand by default OpenFermion is generating one 1s spatial orbital for each of the H atoms and 1s, 2s, 2px, 2py, and 2pz spatial orbitals for the O atom. That adds up to 7 spatial orbitals and 14 spin-orbitals. After applying symmetry_conserving_bravyi_kitaev() I get a 12-qubit Hamiltonian because of the electron number and spin conservation.
My question is how do I freeze the two O electrons in the 1s orbital, so that I get a 10-qubit Hamiltonian?
