Redundantly Amplified Information Suppresses Quantum Correlations in Many-Body Systems

Girolami, Davide; Touil, Akram; Yan, Bin; Deffner, Sebastian; Zurek, Wojciech Hubert

doi:10.1103/physrevlett.129.010401

Title: Redundantly Amplified Information Suppresses Quantum Correlations in Many-Body Systems

Journal Article · Tue Jun 28 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.010401· OSTI ID:1876809

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^[4]; Zurek, Wojciech Hubert ^[3]

DISAT, Politecnico di Torino (Italy)
Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); Universidade Estadual de Campinas, Sao Paulo (Brazil)

We establish bounds on quantum correlations in many-body systems. They reveal what sort of information about a quantum system can be simultaneously recorded in different parts of its environment. Specifically, independent agents who monitor environment fragments can eavesdrop only on amplified and redundantly disseminated—hence, effectively classical—information about the decoherence-resistant pointer observable. We also show that the emergence of classical objectivity is signaled 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 does not need to be postulated and is not accidental, but rather a compelling emergent feature of quantum theory that otherwise—in the absence of decoherence and amplification—leads to “quantum weirdness.” In particular, a lack of consensus between agents that access environment fragments is bounded by the information deficit, a measure of the incompleteness of the information about the system.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Foundational Questions Institute; Fetzer Franklin Fund; USDOE Laboratory Directed Research and Development (LDRD) Program; Italian Ministry of Research and Education (MUIR); Politecnico di Torino

Grant/Contract Number:: 89233218CNA000001; FQXiRFP-1808; FQXiRFP-2020-224322; 54-AI20GD01; 54-RSG20GD01

OSTI ID:: 1876809

Report Number(s):: LA-UR-21-29948; TRN: US2307327

Journal Information:: Physical Review Letters, Vol. 129, Issue 1; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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