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The idea is that you get photons of a opposite spin, but you might have meant that Pincho. From a point of symmetry it should be a symmetric arrangement, and the spin taking itself out in the 'photon' getting down converted to two, maybe? As far as I understand you can't get two down converted photons of a same spin? Can you? Whenever you find them to have the same spin then you can be assured, as I get it, that you are measuring on two uncorrelated photons as the definition should be that you by measuring one set the other state (polarization/spin) But it is a really deep subject, and you need to start from the beginning to understand how they have thought there. After that you're free to smash it to smithereens with logic, and mathematics http://en.wikipedia.org/wiki/EPR_paradox [Links inactive - To make links active and clickable, login or click here to register]And this guy too, he have a very clear mind, at least as I found reading him. http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/quantum_theory_completeness/index.html [Links inactive - To make links active and clickable, login or click here to register]
Pincho, when you write that "Electrons have been recently been found to have a spin spin." you better link to what you think is the experiment proving such a concept. Otherwise it becomes impossible to judge being correct or not.
Hmm "“We know, for example, that a magnet has a lower energy when it is oriented parallel to the geomagnetic field and it lines up with this particular direction — that is how a compass works,” explains Hunter. “Our experiments removed this magnetic interaction and looked to see if there might be some other interaction with our experimental spins. One interpretation of this ‘other’ interaction is that it could be a long-range interaction between the spins in our apparatus and the electron spins within the Earth, that have been aligned by the geomagnetic field. This is the long-range spin-spin interaction we were looking for.” "As I get it, what they are speaking of is not a spin spin interaction inside one object, but a relation between a possible arrangements of spins inside Earth relative spins aligned with, or against, the geomagnetic field? How does that fit your idea?