A property called entanglement entropy helps to describe the quantum states of interacting particles, and it has at last been measured. The findings open the door to a deeper understanding of quantum systems. See Article p.77
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Rolston, S. Getting the measure of entanglement. Nature 528, 48â49 (2015). https://doi.org/10.1038/528048a
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DOI: https://doi.org/10.1038/528048a