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Nonlinear two-level dynamics of quantum time crystals

Author

Listed:
  • S. Autti

    (Aalto University
    Lancaster University)

  • P. J. Heikkinen

    (Aalto University
    Royal Holloway University of London)

  • J. Nissinen

    (Aalto University)

  • J. T. Mäkinen

    (Aalto University)

  • G. E. Volovik

    (Aalto University
    L.D. Landau Institute for Theoretical Physics)

  • V. V. Zavyalov

    (Aalto University
    Lancaster University)

  • V. B. Eltsov

    (Aalto University)

Abstract

A time crystal is a macroscopic quantum system in periodic motion in its ground state. In our experiments, two coupled time crystals consisting of spin-wave quasiparticles (magnons) form a macroscopic two-level system. The two levels evolve in time as determined intrinsically by a nonlinear feedback, allowing us to construct spontaneous two-level dynamics. In the course of a level crossing, magnons move from the ground level to the excited level driven by the Landau-Zener effect, combined with Rabi population oscillations. We demonstrate that magnon time crystals allow access to every aspect and detail of quantum-coherent interactions in a single run of the experiment. Our work opens an outlook for the detection of surface-bound Majorana fermions in the underlying superfluid system, and invites technological exploitation of coherent magnon phenomena – potentially even at room temperature.

Suggested Citation

  • S. Autti & P. J. Heikkinen & J. Nissinen & J. T. Mäkinen & G. E. Volovik & V. V. Zavyalov & V. B. Eltsov, 2022. "Nonlinear two-level dynamics of quantum time crystals," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30783-w
    DOI: 10.1038/s41467-022-30783-w
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