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Analog quantum simulation of the Rabi model in the ultra-strong coupling regime

Author

Listed:
  • Jochen Braumüller

    (Physikalisches Institut, Karlsruhe Institute of Technology)

  • Michael Marthaler

    (Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology)

  • Andre Schneider

    (Physikalisches Institut, Karlsruhe Institute of Technology)

  • Alexander Stehli

    (Physikalisches Institut, Karlsruhe Institute of Technology)

  • Hannes Rotzinger

    (Physikalisches Institut, Karlsruhe Institute of Technology)

  • Martin Weides

    (Physikalisches Institut, Karlsruhe Institute of Technology
    Physikalisches Institut, Johannes Gutenberg University Mainz)

  • Alexey V. Ustinov

    (Physikalisches Institut, Karlsruhe Institute of Technology
    Russian Quantum Center, National University of Science and Technology MISIS)

Abstract

The quantum Rabi model describes the fundamental mechanism of light-matter interaction. It consists of a two-level atom or qubit coupled to a quantized harmonic mode via a transversal interaction. In the weak coupling regime, it reduces to the well-known Jaynes–Cummings model by applying a rotating wave approximation. The rotating wave approximation breaks down in the ultra-strong coupling regime, where the effective coupling strength g is comparable to the energy ω of the bosonic mode, and remarkable features in the system dynamics are revealed. Here we demonstrate an analog quantum simulation of an effective quantum Rabi model in the ultra-strong coupling regime, achieving a relative coupling ratio of g/ω ~ 0.6. The quantum hardware of the simulator is a superconducting circuit embedded in a cQED setup. We observe fast and periodic quantum state collapses and revivals of the initial qubit state, being the most distinct signature of the synthesized model.

Suggested Citation

  • Jochen Braumüller & Michael Marthaler & Andre Schneider & Alexander Stehli & Hannes Rotzinger & Martin Weides & Alexey V. Ustinov, 2017. "Analog quantum simulation of the Rabi model in the ultra-strong coupling regime," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00894-w
    DOI: 10.1038/s41467-017-00894-w
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    Cited by:

    1. Xi Chen & Ze Wu & Min Jiang & Xin-You Lü & Xinhua Peng & Jiangfeng Du, 2021. "Experimental quantum simulation of superradiant phase transition beyond no-go theorem via antisqueezing," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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