The spins of the both electrons of an EPR pair are undetermined before one conducts a measurement on one of them. Does a magnetic field determine (set up or down) the spin of one partner of an EPR pair if it moves through it and hence disentangle the pair? Is there a potential measurement process involved like emission of a photon from this electron? (I can't imagine how this could happen because the electron was in an indefinite energy state too) But if so, can the EPR pair stay entangled when making the process unobservable (by example closing the field in a box)?
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