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... parametric down conversion of photons as...
they pass through an optically nonlinear crystal such as lithium iodate or
barium borate. Here a single photon of frequency f_0 down converts to two
photons in an entangled state whose frequencies f_1+f_2=f_0.
how are the spin states for these photons correlated?
I suspect that their polarization states should be orthogonal.