Lattice light shift of a Wannier-Stark optical lattice clock

Lattice light shift is one of the most important systematic uncertainty sources in optical lattice clocks. As the technology continues to advance, the fractional frequency uncertainty is rapidly approaching the 19th digit, making a thorough understanding of the lattice light shift essential. We present a new evaluation of the lattice light shift in the JILA Wannier-Stark 1D optical lattice clock*. This work highlights the importance of understanding atomic motions and atom-light interaction in shallow lattices, as this understanding is key to reaching the goal of reducing the fractional frequency uncertainty to below 1E-18. Furthermore, we describe recent efforts to address other sources of systematic errors, such as the quadratic Zeeman shift and black body radiation shift.



*arXiv:2210.16374 (2022).