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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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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. |
format | Online Article Text |
id | pubmed-5954151 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
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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