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Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics

Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
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 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.
Sanchez Munoz, Carlos
1a9cb10e-62b2-475b-b283-84cc3f6445e2
Nori, Franco
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De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Sanchez Munoz, Carlos
1a9cb10e-62b2-475b-b283-84cc3f6445e2
Nori, Franco
a90190de-06f0-4686-9fa6-c4ba705ad014
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473

Sanchez Munoz, Carlos, Nori, Franco and De Liberato, Simone (2018) Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics. Nature Communications, 9 (1), [1924]. (doi:10.1038/s41467-018-04339-w).

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Abstract

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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Rabi-USC-Breakdown - Accepted Manuscript
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Accepted/In Press date: 24 April 2018
e-pub ahead of print date: 15 May 2018

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Local EPrints ID: 421300
URI: http://eprints.soton.ac.uk/id/eprint/421300
PURE UUID: 27fc1b63-a429-4e88-bbda-dd20184c5680
ORCID for Simone De Liberato: ORCID iD orcid.org/0000-0002-4851-2633

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Date deposited: 31 May 2018 16:30
Last modified: 07 Oct 2020 04:44

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Author: Carlos Sanchez Munoz
Author: Franco Nori

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