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Nonlinear two-level dynamics of quantum time crystals

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number3090
<mark>Journal publication date</mark>2/06/2022
<mark>Journal</mark>Nature Communications
Number of pages9
Publication StatusPublished
<mark>Original language</mark>English


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.