Redundantly amplified information suppresses quantum correlations in many-body systems
| Autor: | Girolami, D., Touil, A., Yan, B., Deffner, S., Zurek, W. H. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 129, 010401 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.129.010401 |
| Popis: | 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. Comment: LA-UR-21-29948 |
| Databáze: | arXiv |
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