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While certain quantum behaviors are currently limited to atomic systems, researchers keep searching for hints of quantum physics in more massive objects. Now Simon Gröblacher, of Delft University of Technology in the Netherlands, and colleagues have pushed the boundaries of quantum weirdness to macroscopic scales. They demonstrated quantum entanglement and violations of Bell’s inequality—a canonical test of the principle that all influences on a particle are local and that particle states exist independently of the observer. They used two mechanical resonators, each containing roughly 10 billion atoms.

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Category: Science