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Nicolas Gisin is an experimental physicist who has extended the tests of quantum entanglement and nonlocality (the EPR experiment) to many kilometers from his lab in Geneva. His work has confirmed the correctness of quantum mechanics, and with it the irreducible indeterminacy involved in quantum mechanical measurements.
Gisin is the recipient of the first John Stewart Bell prize. It is Bell's Theorem and the Bell Inequalities that Gisin's work has confirmed.
Despite his critical work that grounds quantum physics, Gisin has been active in searching for alternative mathematical formulations of quantum theory, especially ones that might replace the Alternatives proposed by GianCarlo Ghirardi and his colleagues replace the linear Schrödinger equation for the time evolution of the wave function with a nonlinear equation that includes explicit stochastic terms. Gisin also has explored the paradoxical interpretations of his nonlocality experiments. The perfect nonlocal correlation of distant spin states suggests that information is traveling between the two widely separated measurements of electrons in an entangled spin state at velocities greater than the speed of light. This is of course impossible, but Gisin speculates that some "influence" may be affecting both experiments coming from "outside space and time." Gisin says he means by this that "there is no story in space and time" to account for nonlocality. This is of course because the collapse of probabilities is instantaneous (not therefore "in time?") and happens everywhere (surely "in all space?"). If there were such influences, they might provide an explanation for deterministic theories, "some sort of hyper-determinism that would make all Science an illusion," says Gisin. He explains:
Free will
Gisin says about free will,
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The experimental setup for quantum entanglement tests is theoretically simple but experimentally difficult. Two spin 1/2 electrons are prepared in a state, say with opposing spins so the total spin angular momentum of the electrons is zero. They are said to be in a singlet state. Most recent studies, like Gisin's, used entangled polarized photon pairs.)
Two experimenters (call them A and B) measure the electron spins at some later time. The conservation of angular momentum requires that should one of these electrons be measured with spin up, the other must be spin down. This is what is described as "nonlocal" correlation of the spin measurement results. A simpler way of looking at the problem is to consider the conservation of angular momentum, a law of nature that can not be violated. What would the lack of "correlation" between electron spins look like? It would include some spin-up measurements by experimenter A at the same time as spin-up measurements by experimenter B. But this is a clear violation of the conservation law for angular momentum. This conservation law in no way depends on supra-luminal communications between particles. Consider two electrons at opposite ends of the Andromeda galaxy, say 100,000 light years apart. As they revolve around the center of the galaxy, they conserve their orbital angular momenta perfectly. We might say that conservation laws are "outside space-time." Note that the original EPR thought experiment involved electrons going in opposite directions from a central source. In that case the governing conservation law was for ordinary translational momentum. Normal | Teacher | Scholar |