Jonathan G. Richens, John H. Selby, and Sabri W. Al-Safi. “Entanglement is Necessary for Emergent Classicality in All Physical Theories.” Physical Review Letters. DOI: 10.1103/PhysRevLett.119.080503
Is entanglement really necessary for describing the physical world, or is it possible to have some post-quantum theory without entanglement? In a new study, physicists have mathematically proved that any theory that has a classical limit-meaning that it can describe our observations of the classical world by recovering classical theory under certain conditions-must contain entanglement...
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