Entanglement resonance in the asymmetric quantum Rabi model

Yu-Qing Shi, Lei Cong, and Hans-Peter Eckle
Phys. Rev. A 105, 062450 – Published 27 June 2022

Abstract

We investigate the entanglement features in the interacting system of a quantized optical field and a two-level system which is statically driven, known as the asymmetric quantum Rabi model (AsymQRM). Intriguing entanglement resonance valleys with the increase of the photon-atom coupling strength and peaks with the increase of the driving amplitude are found. It is revealed that both of these two kinds of entanglement resonance are caused by the avoided level crossing of the associated eigenenergies. In sharp contrast to the quantum Rabi model, the entanglement of the AsymQRM collapses to zero in the strong coupling regime except when the driving amplitude is equal to mω/2, with m being an integer and ω being the photon frequency. Our analysis demonstrates that such entanglement reappearance is induced by the hidden symmetry of the AsymQRM. Supplying an insightful understanding of the AsymQRM, our results will be helpful in exploring the hidden symmetry and in preparing photon-atom entanglement in light-matter coupled systems.

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  • Received 19 October 2021
  • Revised 29 March 2022
  • Accepted 8 June 2022

DOI:https://doi.org/10.1103/PhysRevA.105.062450

©2022 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Quantum Information, Science & Technology

Authors & Affiliations

Yu-Qing Shi1,2, Lei Cong3,4,5,*, and Hans-Peter Eckle6,†

  • 1School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 2Key Laboratory for Electronic Materials, College of Electrical Engineering, Northwest Minzu University, Lanzhou 730030, China
  • 3International Center of Quantum Artificial Intelligence for Science and Technology (QuArtist) and Department of Physics, Shanghai University, 200444 Shanghai, China
  • 4Helmholtz-Institut, GSI Helmholtzzentrum fur Schwerionenforschung, Mainz 55128, Germany
  • 5Department of Applied Physics, Nanjing Tech University, Nanjing 210009, China
  • 6Humboldt Study Centre, Ulm University, Ulm D-89069, Germany

  • *congllzu@gmail.com
  • hans-peter.eckle@uni-ulm.de

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Issue

Vol. 105, Iss. 6 — June 2022

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