I understand that photons do not change their polarization when they pass through glass because they are not absorbed in the glass due to the band gap.
I also now understand that reflection does not involve the absorption of re-emission of a photon, although I am somewhat unclear at the quantum level what is happening in reflection. It is clear to me that the object reflecting the photon (like a solar sail) slightly increases in momentum, and since momentum is conserved, the photon must have a slight decrease in momentum, which means that the photon must decrease in frequency somewhat upon reflection.
So my question is why does polarization not change on reflection. Is this because it's the same photon (whatever that means), so there is no opportunity for its quantum state to change, even though it's momentum vector has changed?