2026/08/03 by J. P. Salvatierra, M. Barbiero, G. Bertaina +3
Physics and Astronomy · #physics.atom-ph #quant-ph
arxiv created 2026/08/03 · arxiv updated 2026/08/04
We report precise measurements of inter-level interactions in a bosonic optical lattice clock based on 88Sr 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 88Sr 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.