Non-locality. One of the most troubling aspects of field collapse is that it is instantaneous and occurs at the same time at widely separated points. Physicists call this non-locality. This is especially bothersome when the sudden change involves two entangled field quanta. Einstein argued vehemently against the idea of non-locality, claiming that it violated a result of his Principle of Relativity - that nothing can be transmitted faster than the speed of light. Now Einstein's postulate {which we must remember was only a guess} is indeed valid in relation to the evolution and propagation of fields as described by the field equations. However field collapse is not described by the field equations, so there is no reason to expect or to insist that it falls in the domain of Einstein's postulate. Non-locality is a fact; it has been experimentally documented. Nor does it lead to any paradoxes or inconsistencies. Even those who believe in particles as the ultimate reality acknowledge that something happens non-locally. Just as we said, "So the earth is round, not flat; that's surprising but I can live with it", so we can say, "Fields suddenly collapse. It's not what I expected but I can live with it." There are no logical contradictions involved.
( Rodney A. Brooks )
[ Fields of Color: The theory ]
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