Quantum mechanics flummoxes physicists again : Nature News
: "To perform their experiment, Weihs and colleagues aimed a source of single photons (which, like electrons, exhibit wave–particle duality) at a mask containing various open and closed combinations of three slits. The authors fired photons repeatedly through the mask, while building a probability distribution of photons arriving on a detector beyond it. From the probabilities of each combination, they could calculate a crucial interference term, which would highlight any three-path interference."
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