Exotic Quantum States of Circuit Quantum Electrodynamics in the Ultra-Strong Coupling Regime

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4 Citations (Scopus)


The quantum coherent behaviors of superconducting devices at macroscopic scales and recent technical advances in fine tunability have brought the conventional cavity quantum electrodynamics (QED) to superconducting circuits. With an ultra-strong cavity photon–artificial atom coupling and the inherent nonlinearity of the Josephson junctions, the so-called circuit QED offers new opportunities to explore new realms of physics that have remained a challenge for conventional cavity QED. Circuit QED has even attracted public attention as the leading architecture for quantum computation. In this article, a pedagogical review of recent studies and activities on exotic quantum states that can be attributed to ultra-strong coupling is provided. A progress report on attempts to seek the smallest unit of the topological matter and its fundamental interaction with light is also provided.

Original languageEnglish
Article number2000085
JournalAdvanced Quantum Technologies
Issue number12
Publication statusPublished - 2020 Dec

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (Grant Nos. 2017R1E1A1A03070681 and 2018R1A4A1024157) and by the Ministry of Education of Korea through the BK21 Plus?program.

Publisher Copyright:
© 2020 Wiley-VCH GmbH


  • Rabi Hamiltonian
  • circuit QED
  • photon–qubit coupling
  • quantum states
  • superconducting qubits
  • topological matter

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Electronic, Optical and Magnetic Materials
  • Computational Theory and Mathematics
  • Mathematical Physics
  • Electrical and Electronic Engineering


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