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arXiv · 2608.02425

Measurement and control of the interaction frequency shift in bosonic optical lattice clocks

J. P. Salvatierra·M. Barbiero·G. Bertaina·D. Calonico·F. Levi·M. G. Tarallo
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Abstract

We report precise measurements of inter-level interactions in a bosonic optical lattice clock based on $^{88}$Sr atoms. We observe a nonlinear density dependence of the clock shift, even without reaching quantum degeneracy. In a 2D lattice, the Rabi line shape exhibits an interaction sideband consistent with a collective spin model, while in a 1D lattice the shift is modified by density-induced dephasing. These findings, combined with a careful choice of interrogation detuning and atomic density, can enable operation at a net-zero systematic density shift in $^{88}$Sr lattice clocks. We discuss the implications of these findings in many-body physics, quantum simulation, and precision isotope shift measurements, which provide a powerful probe for new physics beyond the Standard Model.

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J. P. Salvatierra, M. Barbiero, G. Bertaina, D. Calonico, F. Levi, M. G. Tarallo. 2026-08-03. Measurement and control of the interaction frequency shift in bosonic optical lattice clocks. https://arxiv.org/abs/2608.02425

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