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• W3104418630 abstract "The theory of quantum Darwinism aims to explain how our objective classical reality arises from the quantum world, by analysing the distribution of information about a quantum system that is accessible to multiple observers, who probe the system by intercepting fragments of its environment. Previous work showed that, when the number of environmental fragments grows, the quantum channels modelling the information flow from system to observers become arbitrarily close—in terms of diamond norm distance—to 'measure-and-prepare' channels, ensuring objectivity of observables; the convergence is formalised by an upper bound on the diamond norm distance, which decreases with increasing number of fragments. Here, we derive tighter diamond norm bounds on the emergence of objectivity of observables for quantum systems of infinite dimension, providing an approach which can bridge between the finite- and the infinite-dimensional cases. Furthermore, we probe the tightness of our bounds by considering a specific model of a system-environment dynamics given by a pure loss channel. Finally, we generalise to infinite dimensions a result obtained by Brandão et al (2015 Nat. Commun. 6 7908), which provides an operational characterisation of quantum discord in terms of one-sided redistribution of correlations to many parties. Our results provide a unifying framework to benchmark quantitatively the rise of objectivity in the quantum-to-classical transition." @default.
• W3104418630 created "2020-11-23" @default.
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• W3104418630 date "2020-09-14" @default.
• W3104418630 modified "2023-09-25" @default.
• W3104418630 title "Refined diamond norm bounds on the emergence of objectivity of observables" @default.
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• W3104418630 doi "https://doi.org/10.1088/1751-8121/aba469" @default.
• W3104418630 hasPublicationYear "2020" @default.
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