Quantum correlations between the parts of composite systems have long fascinated physicists. There is now compelling evidence that such correlations can also occur in systems in which no parts can be identified. See Letter p.490
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Cabello, A. Correlations without parts. Nature 474, 456–458 (2011). https://doi.org/10.1038/474456a
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DOI: https://doi.org/10.1038/474456a
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