Redundantly amplified information suppresses quantum correlations in many-body systems

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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.010401

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https://doi.org/10.1103/PhysRevLett.129.010401
 http://hdl.handle.net/11603/24402

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https://orcid.org/0000-0002-2405-7883
 https://orcid.org/0000-0003-0504-6932

Date

2022-06-28

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journal articles
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Citation of Original Publication

Girolami, Davide et al. "Redundantly amplified information suppresses quantum correlations in many-body systems." Phys. Rev. Lett. 129, 010401 (28 June 2022). https://doi.org/10.1103/PhysRevLett.129.010401

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This is a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

We quantify how much information about a quantum system can be simultaneously recorded in different parts of its environment, by establishing quantitative bounds on bipartite quantum correlations in many-body systems. Tight limits on quantum discord dictate that independent observers who monitor environmental fragments can eavesdrop only on amplified and redundantly disseminated - hence, effectively classical - information about the system, i.e., information about its unique pointer observable. We also show how the emergence of classical objectivity is signalled by a distinctive scaling of the conditional mutual information, bypassing hard numerical optimizations. Our results validate the core idea of Quantum Darwinism: objective classical reality need not be postulated and is not accidental, but rather a compelling, emergent feature of a quantum world.