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Quantum annealing of a frustrated magnet

Author

Listed:
  • Yuqian Zhao

    (Huazhong University of Science and Technology)

  • Zhaohua Ma

    (Huazhong University of Science and Technology)

  • Zhangzhen He

    (Chinese Academy of Sciences)

  • Haijun Liao

    (Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Yan-Cheng Wang

    (Beihang University
    Tianmushan Laboratory)

  • Junfeng Wang

    (Huazhong University of Science and Technology)

  • Yuesheng Li

    (Huazhong University of Science and Technology)

Abstract

Quantum annealing, which involves quantum tunnelling among possible solutions, has state-of-the-art applications not only in quickly finding the lowest-energy configuration of a complex system, but also in quantum computing. Here we report a single-crystal study of the frustrated magnet α-CoV2O6, consisting of a triangular arrangement of ferromagnetic Ising spin chains without evident structural disorder. We observe quantum annealing phenomena resulting from time-reversal symmetry breaking in a tiny transverse field. Below ~ 1 K, the system exhibits no indication of approaching the lowest-energy state for at least 15 hours in zero transverse field, but quickly converges towards that configuration with a nearly temperature-independent relaxation time of ~ 10 seconds in a transverse field of ~ 3.5 mK. Our many-body simulations show qualitative agreement with the experimental results, and suggest that a tiny transverse field can profoundly enhance quantum spin fluctuations, triggering rapid quantum annealing process from topological metastable Kosterlitz-Thouless phases, at low temperatures.

Suggested Citation

  • Yuqian Zhao & Zhaohua Ma & Zhangzhen He & Haijun Liao & Yan-Cheng Wang & Junfeng Wang & Yuesheng Li, 2024. "Quantum annealing of a frustrated magnet," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47819-y
    DOI: 10.1038/s41467-024-47819-y
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    References listed on IDEAS

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