Quasi-superradiant soliton state of matter in quantum metamaterials

Hidehiro Asai (), Shiro Kawabata, Sergey E. Savel’ev and Alexandre M. Zagoskin
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Hidehiro Asai: Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST)
Shiro Kawabata: Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST)
Sergey E. Savel’ev: Loughborough University
Alexandre M. Zagoskin: Loughborough University

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 2, 1-6

Abstract: Abstract 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 superfluorescence). 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.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2017-80567-7

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