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Quasi-Floquet Prethermalization in a Disordered Dipolar Spin Ensemble in Diamond
Guanghui He1, Bingtian Ye2,3, Ruotian Gong1
1Department of Physics, Washington University, St. Louis, Missouri 63130, USA.
Physical Review Letters
|October 13, 2023
Summary
Researchers observed Floquet prethermalization in diamond spin ensembles, a quantum state stabilized by high-frequency driving. This prethermal regime, crucial for quantum technologies, showed sensitivity to driving field smoothness in quasiperiodic systems.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum information science
Background:
- Floquet driving enables engineering of quantum systems and realizing novel states of matter.
- Stabilizing quantum phenomena requires preventing energy absorption from driving fields, often achieved by high-frequency drives creating a prethermal regime.
- The prethermal regime's existence depends on interaction range and driving frequencies.
Purpose of the Study:
- To experimentally observe Floquet prethermalization in a strongly interacting dipolar spin ensemble.
- To investigate the impact of quasi-Floquet drives with multiple frequencies on prethermalization.
- To explore methods for stabilizing and characterizing nonequilibrium quantum phenomena.
Main Methods:
- Utilized a strongly interacting dipolar spin ensemble in diamond.
- Applied high-frequency Floquet driving (single and multiple incommensurate frequencies).
- Analyzed the angular dependence of dipolar coupling to mitigate long-range interactions.
Main Results:
- Successfully observed Floquet prethermalization in the diamond spin ensemble.
- Demonstrated prethermalization with quasi-Floquet drives (multiple frequencies).
- Found that prethermalization in quasiperiodic drives is highly sensitive to the smoothness of the applied field.
Conclusions:
- Floquet prethermalization is achievable in strongly interacting dipolar spin systems.
- Quasiperiodic driving offers new avenues for quantum control but requires precise field control.
- This work paves the way for stabilizing and characterizing complex nonequilibrium quantum phenomena.
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