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Quasi-superradiant soliton state of matter in quantum metamaterials

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journal contribution
posted on 05.01.2018 by Hidehiro Asai, Shiro Kawabata, Sergey Saveliev, Alexandre M. Zagoskin
Strong interaction of a system of quantum emitters (e.g., two-level atoms) with electromagnetic field induces specific correlations in the system accompanied by a drastic increase of emitted radiation (superradiation or superuorescence). Despite the fact that since its prediction this phenomenon was subject to a vigorous experimental and theoretical research, there remain open question, in particular, concerning the possibility of a first order phase transition to the superradiant state from the vacuum state. In systems of natural and charge-based artificial atom this transition is prohibited by \no-go" theorems. Here we demonstrate numerically and confirm analytically a similar transition in a one-dimensional quantum metamaterial { a chain of artificial atoms (qubits) strongly interacting with classical electromagnetic fields in a transmission line. The system switches from vacuum state to the quasi-superradiant (QS) phase with one or several magnetic solitons and finite average occupation of qubit excited states along the transmission line. A quantum metamaterial in the QS phase circumvents the \no-go" restrictions by considerably decreasing its total energy relative to the vacuum state by exciting nonlinear electromagnetic solitons.


SES acknowledge support from Leverhulme Trust. AMZ was supported in part by the EPSRC grant EP/M006581/1 and by the Ministry of Education and Science of the Russian Federa tion in the framework of Increase Competitiveness Program of NUST MISiS (No. K2-2014-015). H.A. was partially supported by a Grant-in-Aid for Young Scientists (B) from JSPS (Grant No. 26790062). S.K was partially supported by a Grant-in-Aid for Scientific Research (C) from JSPS (Grant No. 24510146).



  • Science


  • Physics

Published in

The European Physical Journal B - Condensed Matter and Complex Systems


ASAI, H. ...et al., 2018. Quasi-superradiant soliton state of matter in quantum metamaterials. European Physical Journal B - Condensed Matter and Complex Systems, 91 (2), Article 30.


© EDP Sciences, Societa Italiana di Fisica, Springer-Verlag


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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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The final publication is available at Springer via https://doi.org/10.1140/epjb/e2017-80567-7






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