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Virtual photons in the ground state of a dissipative system

Virtual photons in the ground state of a dissipative system
Virtual photons in the ground state of a dissipative system
Much of the novel physics predicted to be observable in the ultrastrong light-matter coupling regime rests on the hybridisation between states with different numbers of excitations, leading to a population of virtual photons in the system’s ground state. In this article, exploiting an exact diagonalization approach, we derive both analytical and numerical results for the population of virtual photons in presence of arbitrary losses. Specialising our results to the case of Lorentzian resonances we then show that the virtual photon population is only quantitatively affected by losses, even when those become the dominant energy scale. Our results demonstrate most of the ultrastrong-coupling phenomenology can be observed in loss-dominated systems which are not even in the standard strong coupling regime. We thus open the possibility to investigate ultrastrong-coupling physics to platforms that were previously considered unsuitable due to their large losses.
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473

De Liberato, Simone (2017) Virtual photons in the ground state of a dissipative system. Nature Communications, 8, [1465]. (doi:10.1038/s41467-017-01504-5).

Record type: Article

Abstract

Much of the novel physics predicted to be observable in the ultrastrong light-matter coupling regime rests on the hybridisation between states with different numbers of excitations, leading to a population of virtual photons in the system’s ground state. In this article, exploiting an exact diagonalization approach, we derive both analytical and numerical results for the population of virtual photons in presence of arbitrary losses. Specialising our results to the case of Lorentzian resonances we then show that the virtual photon population is only quantitatively affected by losses, even when those become the dominant energy scale. Our results demonstrate most of the ultrastrong-coupling phenomenology can be observed in loss-dominated systems which are not even in the standard strong coupling regime. We thus open the possibility to investigate ultrastrong-coupling physics to platforms that were previously considered unsuitable due to their large losses.

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Accepted/In Press date: 22 September 2017
e-pub ahead of print date: 13 November 2017

Identifiers

Local EPrints ID: 416117
URI: http://eprints.soton.ac.uk/id/eprint/416117
PURE UUID: a511859d-1fa7-4cd9-bcc3-4438d2548084
ORCID for Simone De Liberato: ORCID iD orcid.org/0000-0002-4851-2633

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Date deposited: 04 Dec 2017 17:30
Last modified: 07 Oct 2020 04:10

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