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Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics

Recent technological developments have made it increasingly easy to access the non-perturbative regimes of cavity quantum electrodynamics known as ultrastrong or deep strong coupling, where the light–matter coupling becomes comparable to the bare modal frequencies. In this work, we address the adequ...

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Autores principales: Sánchez Muñoz, Carlos, Nori, Franco, De Liberato, Simone
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5954151/
https://www.ncbi.nlm.nih.gov/pubmed/29765054
http://dx.doi.org/10.1038/s41467-018-04339-w
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author Sánchez Muñoz, Carlos
Nori, Franco
De Liberato, Simone
author_facet Sánchez Muñoz, Carlos
Nori, Franco
De Liberato, Simone
author_sort Sánchez Muñoz, Carlos
collection PubMed
description Recent technological developments have made it increasingly easy to access the non-perturbative regimes of cavity quantum electrodynamics known as ultrastrong or deep strong coupling, where the light–matter coupling becomes comparable to the bare modal frequencies. In this work, we address the adequacy of the broadly used single-mode cavity approximation to describe such regimes. We demonstrate that, in the non-perturbative light–matter coupling regimes, the single-mode models become unphysical, allowing for superluminal signalling. Moreover, considering the specific example of the quantum Rabi model, we show that the multi-mode description of the electromagnetic field, necessary to account for light propagation at finite speed, yields physical observables that differ radically from their single-mode counterparts already for moderate values of the coupling. Our multi-mode analysis also reveals phenomena of fundamental interest on the dynamics of the intracavity electric field, where a free photonic wavefront and a bound state of virtual photons are shown to coexist.
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spelling pubmed-59541512018-05-17 Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics Sánchez Muñoz, Carlos Nori, Franco De Liberato, Simone Nat Commun Article Recent technological developments have made it increasingly easy to access the non-perturbative regimes of cavity quantum electrodynamics known as ultrastrong or deep strong coupling, where the light–matter coupling becomes comparable to the bare modal frequencies. In this work, we address the adequacy of the broadly used single-mode cavity approximation to describe such regimes. We demonstrate that, in the non-perturbative light–matter coupling regimes, the single-mode models become unphysical, allowing for superluminal signalling. Moreover, considering the specific example of the quantum Rabi model, we show that the multi-mode description of the electromagnetic field, necessary to account for light propagation at finite speed, yields physical observables that differ radically from their single-mode counterparts already for moderate values of the coupling. Our multi-mode analysis also reveals phenomena of fundamental interest on the dynamics of the intracavity electric field, where a free photonic wavefront and a bound state of virtual photons are shown to coexist. Nature Publishing Group UK 2018-05-15 /pmc/articles/PMC5954151/ /pubmed/29765054 http://dx.doi.org/10.1038/s41467-018-04339-w Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Sánchez Muñoz, Carlos
Nori, Franco
De Liberato, Simone
Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
title Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
title_full Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
title_fullStr Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
title_full_unstemmed Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
title_short Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
title_sort resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5954151/
https://www.ncbi.nlm.nih.gov/pubmed/29765054
http://dx.doi.org/10.1038/s41467-018-04339-w
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