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Classical system boundaries cannot be determined within quantum Darwinism Chris Fields 21 Rue des Lavandières, Caunes Minervois, 11160 France Abstract: Multiple observers who interact with environmental encodings of the states of a macroscopic quantum system S as required by quantum Darwinism cannot demonstrate that they are jointly observing S without a joint a priori assumption of a classical boundary separating S from its environment E. Quantum Darwinism cannot, therefore, be regarded as providing a purely quantum-mechanical explanation of the "emergence" of classicality. |