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Quantum mechanics

To be or not to be local

The experimental violation of mathematical relations known as Bell's inequalities sounded the death-knell of Einstein's idea of 'local realism' in quantum mechanics. But which concept, locality or realism, is the problem?

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Aspect, A. To be or not to be local. Nature 446, 866–867 (2007). https://doi.org/10.1038/446866a

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