Quantum coherence and speed limit in the mean-field Dicke model of superradiance

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dc.contributor.authorRossatto, D. Z. [UNESP]
dc.contributor.authorPires, D. P.
dc.contributor.authorDe Paula, F. M.
dc.contributor.authorDe Sá Neto, O. P.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal Do Rio Grande Do Norte
dc.contributor.institutionUniversidade Federal do ABC (UFABC)
dc.contributor.institutionUniversidade Estadual Do Piauí
dc.date.accessioned2021-06-25T10:45:41Z
dc.date.available2021-06-25T10:45:41Z
dc.date.issued2020-11-16
dc.description.abstractDicke superrandiance is a cooperative phenomenon which arises from the collective coupling of an ensemble of atoms to the electromagnetic radiation. Here we discuss the quantifying of quantum coherence for the Dicke model of superradiance in the mean-field approximation. We found the single-atom l1 norm of coherence is given by the square root of the normalized average intensity of radiation emitted by the superradiant system. This validates quantum coherence as a useful figure of merit towards the understanding of superradiance phenomenon in the mean-field approach. In particular, this result suggests probing the single-atom coherence through the radiation intensity in superradiant systems, which might be useful in experimental realizations where is unfeasible to address atoms individually. Furthermore, given the nonlinear unitary dynamics of the time-dependent single-atom state that effectively describes the system of N atoms, we analyze the quantum speed limit time and its interplay with the l1 norm of coherence. We verify the quantum coherence speeds up the evolution of the superradiant system, i.e., the more coherence stored on the single-atom state, the faster the evolution. These findings unveil the role played by quantum coherence in superradiant systems, which in turn could be of interest for communities of both condensed matter physics and quantum optics.en
dc.description.affiliationUniversidade Estadual Paulista (Unesp) Campus Experimental de Itapeva
dc.description.affiliationDepartamento de Física Teórica e Experimental Universidade Federal Do Rio Grande Do Norte
dc.description.affiliationCentro de Ciências Naturais e Humanas Universidade Federal Do ABC
dc.description.affiliationCoordenação de Ciência da Computação Universidade Estadual Do Piauí
dc.description.affiliationPPGQ Universidade Estadual Do Piauí, Rua João Cabral 2231
dc.description.affiliationUnespUniversidade Estadual Paulista (Unesp) Campus Experimental de Itapeva
dc.identifierhttp://dx.doi.org/10.1103/PhysRevA.102.053716
dc.identifier.citationPhysical Review A, v. 102, n. 5, 2020.
dc.identifier.doi10.1103/PhysRevA.102.053716
dc.identifier.issn2469-9934
dc.identifier.issn2469-9926
dc.identifier.scopus2-s2.0-85096921830
dc.identifier.urihttp://hdl.handle.net/11449/206899
dc.language.isoeng
dc.relation.ispartofPhysical Review A
dc.sourceScopus
dc.titleQuantum coherence and speed limit in the mean-field Dicke model of superradianceen
dc.typeArtigo

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