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Trapped Ion Quantum Computing

Quantum instanton approach to metastable collective spins

arXiv
Authors: Krzysztof Ptaszynski, Maciej Chudak, Massimiliano Esposito

Year

2026

Paper ID

48685

Status

Preprint

Abstract Read

~2 min

Abstract Words

113

Citations

0

Abstract

Collective spin systems - spin ensembles coupled to a common reservoir and effectively described by a single macrospin - play an important role in both atomic and solid-state physics. Their intrinsic nonlinearity gives rise to multiple long-lived metastable states that ultimately relax to a unique most probable state. This dominant state can change with a control parameter, leading to first-order phase transitions. We develop a real-time instanton approach based on quantum quasiprobability dynamics that captures the stationary state in the large-spin limit and the asymptotic scaling of relaxation rates. We further show that these features are not accurately described by the previously applied semiclassical Wigner approach due to its neglect of non-Gaussian fluctuations.

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  • Collective spin systems - spin ensembles coupled to a common reservoir and effectively described by a single macrospin - play an important role in both atomic and solid-state...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2604.15091 [2] arXiv https://arxiv.org/abs/2604.15091 [3] Publisher https://arxiv.org/abs/2604.15091

Local Citation Graph (Related-Paper Links)

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External citation index: OpenAlex citation signal • updated 2026-06-24 02:45:27

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