Nonlinear two-level dynamics of quantum time crystals

S. Autti (), P. J. Heikkinen, J. Nissinen, J. T. Mäkinen, G. E. Volovik, V. V. Zavyalov and V. B. Eltsov
Additional contact information
S. Autti: Aalto University
P. J. Heikkinen: Aalto University
J. Nissinen: Aalto University
J. T. Mäkinen: Aalto University
G. E. Volovik: Aalto University
V. V. Zavyalov: Aalto University
V. B. Eltsov: Aalto University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-30783-w

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