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- W2891777504 abstract "Quantum Darwinism and spectrum broadcast structure describe the emergence of objectivity in quantum systems. However, it is unclear whether these two frameworks lead to consistent predictions on the objectivity of the state of a quantum system in a given scenario. In this paper, we jointly investigate quantum Darwinism and spectrum broadcasting, as well as the subdivision of quantum Darwinism into accessible information and quantum discord, in a two-level system interacting with an $N$-level environment via a random matrix coupling. We propose a novel partial trace method to suitably and consistently partition the effective $N$-level environment, and compare the predictions with those obtained using the partitioning method proposed by Perez [Phys. Rev. A 81, 052326 (2010)]. We find that Quantum Darwinism can apparently emerge under the Perez trace even when spectrum broadcast structure does not emerge, and the majority of the quantum mutual information between system and environment fractions is in fact quantum in nature. This work therefore shows there can be discrepancies between quantum Darwinism, and the nature of information and spectrum broadcast structure." @default.
- W2891777504 created "2018-09-27" @default.
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- W2891777504 date "2018-09-05" @default.
- W2891777504 modified "2023-10-16" @default.
- W2891777504 title "Objectivity (or lack thereof): Comparison between predictions of quantum Darwinism and spectrum broadcast structure" @default.
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- W2891777504 doi "https://doi.org/10.1103/physreva.98.032103" @default.
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