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

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

Atomic Physics 2026-08-03 v1 Quantum Physics

Authors: J. P. Salvatierra , M. Barbiero , G. Bertaina , D. Calonico , F. Levi , M. G. Tarallo

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.

Keywords

optical lattice clock strontium-88 interaction shift density dependence collective spin many-body physics precision measurement

Cite

@article{arxiv.2608.02425,
  title  = {Measurement and control of the interaction frequency shift in bosonic optical lattice clocks},
  author = {J. P. Salvatierra and M. Barbiero and G. Bertaina and D. Calonico and F. Levi and M. G. Tarallo},
  journal= {arXiv preprint arXiv:2608.02425},
  year   = {2026}
}