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Quantum mechanical interaction-free measurements

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A novel manifestation of nonlocality of quantum mechanics is presented. It is shown that it is possible to ascertain the existence of an object in a given region of space without interacting with it. The method might have practical applications for delicate quantum experiments.

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Elitzur, A.C., Vaidman, L. Quantum mechanical interaction-free measurements. Found Phys 23, 987–997 (1993).

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