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Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime

Author

Listed:
  • Johannes Koch

    (Universität Bonn)

  • Geram R. Hunanyan

    (Universität Bonn)

  • Till Ockenfels

    (Universität Bonn)

  • Enrique Rico

    (University of the Basque Country UPV/EHU
    University of the Basque Country UPV/EHU
    IKERBASQUE, Basque Foundation for Science)

  • Enrique Solano

    (University of the Basque Country UPV/EHU
    IKERBASQUE, Basque Foundation for Science
    Kipu Quantum
    Shanghai University)

  • Martin Weitz

    (Universität Bonn)

Abstract

The coupling of a two-level system with an electromagnetic field, whose fully quantized version is the quantum Rabi model, is among the central topics of quantum physics. When the coupling strength becomes large enough that the field mode frequency is reached, the deep strong coupling regime is approached, and excitations can be created from the vacuum. Here we demonstrate a periodic variant of the quantum Rabi model in which the two-level system is encoded in the Bloch band structure of cold rubidium atoms in optical potentials. With this method we achieve a Rabi coupling strength of 6.5 times the field mode frequency, which is far in the deep strong coupling regime, and observe a subcycle timescale raise in bosonic field mode excitations. In a measurement recorded in the basis of the coupling term of the quantum Rabi Hamiltonian, a freezing of dynamics is revealed for small frequency splittings of the two-level system, as expected when the coupling term dominates over all other energy scales, and a revival for larger splittings. Our work demonstrates a route to realize quantum-engineering applications in yet unexplored parameter regimes.

Suggested Citation

  • Johannes Koch & Geram R. Hunanyan & Till Ockenfels & Enrique Rico & Enrique Solano & Martin Weitz, 2023. "Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36611-z
    DOI: 10.1038/s41467-023-36611-z
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    References listed on IDEAS

    as
    1. Ivan V. Pechenezhskiy & Raymond A. Mencia & Long B. Nguyen & Yen-Hsiang Lin & Vladimir E. Manucharyan, 2020. "The superconducting quasicharge qubit," Nature, Nature, vol. 585(7825), pages 368-371, September.
    2. N. K. Langford & R. Sagastizabal & M. Kounalakis & C. Dickel & A. Bruno & F. Luthi & D. J. Thoen & A. Endo & L. DiCarlo, 2017. "Experimentally simulating the dynamics of quantum light and matter at deep-strong coupling," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
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    Cited by:

    1. Hu, Gaoke & Liu, Maoxin & Chen, Xiaosong, 2023. "Quantum phase transition and eigen microstate condensation in the quantum Rabi model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 630(C).

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