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It's in fact straightforward to add the momentum part, but it doesn't help to understand the issue of (non)locality. Usually only the polarization part is analyzed explicitly because only the polarization is measured in experiments that violate Bell-like inequalities.vanhees71 said:I think what's also often missing in all these discussions (including the ones running in the parallel thread on entanglement swaping a la Zeilinger et al) is that never the complete state of the entangled photons is considered. It's just written down the polarization part but not the momentum part, which is however important in the considerations of locality arguments. I think this deserves another FAQ/Insight article. Maybe then my point of view becomes clearer too.