AI 中文总结
该研究测量了玻色子光晶格钟中$^{88}$Sr原子的能级间相互作用，发现其钟频移的非线性密度依赖特性，可通过调控探测失谐与原子密度实现净零系统密度频移运行，为新物理探测提供支撑。
AI 中文摘要
我们报告了基于$^{88}$Sr原子的玻色子光晶格钟中能级间相互作用的精确测量结果。即便未达到量子简并态，我们仍观测到钟频移具有非线性密度依赖性。在二维晶格中，拉比线形呈现出与集体自旋模型相符的相互作用边带；而在一维晶格中，该频移会被密度诱导的退相所修正。这些发现结合对探测失谐和原子密度的精心选择，可使$^{88}$Sr晶格钟在净零系统密度频移下运行。我们还讨论了这些发现对多体物理、量子模拟以及精密同位素频移测量的意义，后者为超出标准模型的新物理提供了有力探测手段。
英文摘要
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.
