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Quantum annealing of a frustrated magnet. | LitMetric

Quantum annealing of a frustrated magnet.

Nat Commun

Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, 430074, Wuhan, China.

Published: April 2024

AI Article Synopsis

  • - Quantum annealing uses quantum tunneling to find the lowest-energy states in complex systems and has practical applications in quantum computing.
  • - A study of the frustrated magnet α-CoVO revealed that below ~1 K, the system doesn't reach its lowest-energy state without a transverse field, but does so quickly in a small transverse field.
  • - Simulations support the experimental findings, suggesting that even a tiny transverse field significantly boosts quantum spin fluctuations, leading to faster quantum annealing at low temperatures from stable states known as Kosterlitz-Thouless phases.

Article 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-CoVO, 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.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11045780PMC
http://dx.doi.org/10.1038/s41467-024-47819-yDOI Listing

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