Redundantly amplified information suppresses quantum correlations in
many-body systems
- URL: http://arxiv.org/abs/2202.09328v2
- Date: Tue, 28 Jun 2022 19:57:06 GMT
- Title: Redundantly amplified information suppresses quantum correlations in
many-body systems
- Authors: D. Girolami, A. Touil, B. Yan, S. Deffner, and W. H. Zurek
- Abstract summary: We show that independent agents who monitor environment fragments can eavesdrop only on amplified and redundantly disseminated information.
We also show that the emergence of classical objectivity is signaled by a distinctive scaling of the conditional mutual information.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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 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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