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Composite Discordant States and Quantum Darwinism

The framework of Quantum Darwinism strives at characterizing the quantum-to-classical transition by introducing the concept of redundancy of information—as measured by Mutual Information—that a set of observers would acquire on the state of a physical system of interest. Further development on this...

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Autores principales: Ryan, Eoghan, Paternostro, Mauro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689335/
https://www.ncbi.nlm.nih.gov/pubmed/36359603
http://dx.doi.org/10.3390/e24111509
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author Ryan, Eoghan
Paternostro, Mauro
author_facet Ryan, Eoghan
Paternostro, Mauro
author_sort Ryan, Eoghan
collection PubMed
description The framework of Quantum Darwinism strives at characterizing the quantum-to-classical transition by introducing the concept of redundancy of information—as measured by Mutual Information—that a set of observers would acquire on the state of a physical system of interest. Further development on this concept, in the form of Strong Quantum Darwinism and Spectrum Broadcast Structures, has recently led to a more fine-grained identification of the nature of such information, which should not involve any quantum correlations between observing and observed systems, while the assessment of information proliferation from individual systems has attracted most of the attention so far, the way such mechanism takes place in more complex states is open to exploration. To this end, we shall consider a two-qubit state, sharing initial quantum correlations in the form of Quantum Discord, and different dephasing-like interactions between them and an observing environment. We will focus on the amount of information regarding the subsystem not involved in the interaction that is proliferated to the environment. We shall refer to this as mediated redundancy. We will show that, in some cases, the channel capacity of the subsystems, given these interactions, can exceed that of the fragments.
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spelling pubmed-96893352022-11-25 Composite Discordant States and Quantum Darwinism Ryan, Eoghan Paternostro, Mauro Entropy (Basel) Article The framework of Quantum Darwinism strives at characterizing the quantum-to-classical transition by introducing the concept of redundancy of information—as measured by Mutual Information—that a set of observers would acquire on the state of a physical system of interest. Further development on this concept, in the form of Strong Quantum Darwinism and Spectrum Broadcast Structures, has recently led to a more fine-grained identification of the nature of such information, which should not involve any quantum correlations between observing and observed systems, while the assessment of information proliferation from individual systems has attracted most of the attention so far, the way such mechanism takes place in more complex states is open to exploration. To this end, we shall consider a two-qubit state, sharing initial quantum correlations in the form of Quantum Discord, and different dephasing-like interactions between them and an observing environment. We will focus on the amount of information regarding the subsystem not involved in the interaction that is proliferated to the environment. We shall refer to this as mediated redundancy. We will show that, in some cases, the channel capacity of the subsystems, given these interactions, can exceed that of the fragments. MDPI 2022-10-22 /pmc/articles/PMC9689335/ /pubmed/36359603 http://dx.doi.org/10.3390/e24111509 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ryan, Eoghan
Paternostro, Mauro
Composite Discordant States and Quantum Darwinism
title Composite Discordant States and Quantum Darwinism
title_full Composite Discordant States and Quantum Darwinism
title_fullStr Composite Discordant States and Quantum Darwinism
title_full_unstemmed Composite Discordant States and Quantum Darwinism
title_short Composite Discordant States and Quantum Darwinism
title_sort composite discordant states and quantum darwinism
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689335/
https://www.ncbi.nlm.nih.gov/pubmed/36359603
http://dx.doi.org/10.3390/e24111509
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