You're begging the question. I'm aware that most physicists believe photon states can be entangled. My point is that it's not clear that quantum entanglement

You're begging the question. I'm aware that most physicists believe photon states can be entangled. My point is that it's not clear that quantum entanglement is used in this computation. There are so many photons being used that it would be possible for the probability waves to be approximated by the frequency distribution of the photons' states.