Nonlinear two-level dynamics of quantum time crystals

S. Autti; P. J. Heikkinen; J. Nissinen; J. T. Mäkinen; G. E. Volovik; V. V. Zavyalov; V. B. Eltsov

doi:10.1038/s41467-022-30783-w

Nonlinear two-level dynamics of quantum time crystals

S. Autti^*, P. J. Heikkinen, J. Nissinen, J. T. Mäkinen, G. E. Volovik, V. V. Zavyalov, V. B. Eltsov

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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.

Original language	English
Article number	3090
Pages (from-to)	1-9
Number of pages	9
Journal	Nature Communications
Volume	13
Issue number	1
DOIs	https://doi.org/10.1038/s41467-022-30783-w
Publication status	Published - 2 Jun 2022
MoE publication type	A1 Journal article-refereed

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Nonlinear two-level dynamics of quantum time crystalsFinal published version, 1.17 MBLicence: CC BY

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title = "Nonlinear two-level dynamics of quantum time crystals",

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.",

author = "S. Autti and Heikkinen, {P. J.} and J. Nissinen and M{\"a}kinen, {J. T.} and Volovik, {G. E.} and Zavyalov, {V. V.} and Eltsov, {V. B.}",

note = "| openaire: EC/H2020/694248/EU//TOPVAC | openaire: EC/H2020/824109/EU//EMP Funding Information: We thank A. Veps{\"a}l{\"a}inen for stimulating discussions. This work has been supported by the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation programme (Grant Agreement No. 694248) and additionally by the European Union{\textquoteright}s Horizon 2020 research and innovation programme under Grant Agreement No. 824109. The experimental work was carried out in the Low Temperature Laboratory, which is a part of the OtaNano research infrastructure of Aalto University and of the European Microkelvin Platform. S.A. and V.V.Z. were funded by UK EPSRC (EP/P024203/1, EP/W015730/1). S.A. acknowledges support from the Jenny and Antti Wihuri foundation, and P.J.H. that from the V{\"a}is{\"a}l{\"a} foundation of the Finnish Academy of Science and Letters. We acknowledge the computational resources provided by the Aalto Science-IT project. ",

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AU - Zavyalov, V. V.

AU - Eltsov, V. B.

N1 - | openaire: EC/H2020/694248/EU//TOPVAC | openaire: EC/H2020/824109/EU//EMP Funding Information: We thank A. Vepsäläinen for stimulating discussions. This work has been supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 694248) and additionally by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 824109. The experimental work was carried out in the Low Temperature Laboratory, which is a part of the OtaNano research infrastructure of Aalto University and of the European Microkelvin Platform. S.A. and V.V.Z. were funded by UK EPSRC (EP/P024203/1, EP/W015730/1). S.A. acknowledges support from the Jenny and Antti Wihuri foundation, and P.J.H. that from the Väisälä foundation of the Finnish Academy of Science and Letters. We acknowledge the computational resources provided by the Aalto Science-IT project.

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N2 - 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.

AB - 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.

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Nonlinear two-level dynamics of quantum time crystals

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TOPVAC: From Topological Matter to Relativistic Quantum Vacuum

OtaNano

OtaNano – Low Temperature Laboratory

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Nonlinear two-level dynamics of quantum time crystals

Abstract

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TOPVAC: From Topological Matter to Relativistic Quantum Vacuum

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OtaNano

OtaNano – Low Temperature Laboratory

Science-IT

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