Journal
NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-30783-w
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Funding
- European Research Council (ERC) under the European Union [694248]
- European Union [824109]
- UK EPSRC [EP/P024203/1, EP/W015730/1]
- Jenny and Antti Wihuri foundation
- Vaisala foundation of the Finnish Academy of Science and Letters
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Time crystals are macroscopic quantum systems that exhibit periodic motion in their ground state. Experimental studies show that time crystals formed by spin-wave quasiparticles can provide detailed insights into quantum-coherent interactions. The dynamics of such quantum time crystals closely resemble that of a two-level system, influenced by nonlinear feedback mechanisms.
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. Recent work has reported a realization of a time crystal in the form of the Bose-Einstein condensate of magnons in superfluid He-3. Here, the authors study the dynamics of a pair of such quantum time crystals and show that it closely resembles the evolution of a two-level system, modified by nonlinear feedback.
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