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The above circles represent electrons in an EPR entanglement experiment. In this experiment, Stern-Gerlach devices are measuring the spin of two entangled particles, the poles of which are shown by the magenta and green. In the setup shown, the gray marks an area which will be measured to be "spin-up" by each device. They measurement devices are offset by 120 degrees. The dark gray area represents the portion where both the vertical (V+) and right hand oriented (R+) devices will measure spin-up. According to classical mechanics, the measurement of the spin of one particle should not influence the other particle. As is shown by the conditional probabilities, this is not the case in quantum mechanics.

On the left side of the picture is the classical model of spin, in which spin is a definite property of electrons at all times. As a conserved property, spin will classically always be opposite in entangled particles. The right hand image represents one possible quantum model. The results of this quantum model mimic experimental results, however, it is impossible to know the internal mechanisms that have caused those results in experiments.