Degeneracy-governed spin squeezing in high-spin Fermi-Hubbard systems weakly coupled to light

Hubert Dunikowski; Emilia Witkowska

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arXiv · 2606.23330

Degeneracy-governed spin squeezing in high-spin Fermi-Hubbard systems weakly coupled to light

Hubert Dunikowski·Emilia Witkowska

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Abstract

High-spin alkaline-earth fermions in optical lattices are promising platforms for spin squeezing beyond the spin-1/2 paradigm. We show that spin-squeezing dynamics is qualitatively modified by degeneracies inherent to the extended internal spin structure. We identify these degeneracies as the microscopic origin of the breakdown of the conventional maximal-spin description and develop an effective population-eigenstate framework that quantitatively reproduces the spin-squeezing dynamics. Our results establish degeneracy as a generic driver of collective spin dynamics in high-spin systems.

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Hubert Dunikowski, Emilia Witkowska. 2026-06-22. Degeneracy-governed spin squeezing in high-spin Fermi-Hubbard systems weakly coupled to light. https://arxiv.org/abs/2606.23330

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