Lattice Light Shift Evaluations In a Dual-Ensemble Yb Optical Lattice Clock

TL;DR

This paper introduces a novel dual-ensemble method and a running wave technique to accurately evaluate lattice light shifts, addressing discrepancies in atomic polarizability measurements in Yb optical lattice clocks.

Contribution

It presents a new combined imaging and multi-ensemble approach along with a running wave method for precise lattice light shift evaluation in optical lattice clocks.

Findings

Effective evaluation of atomic multipolarizability and hyperpolarizability coefficients.

Rapid assessment of differential frequency shifts in dual-ensemble clocks.

Demonstration of a new technique for future light shift measurements.

Abstract

In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a break-down of magic wavelength trapping. In this Letter, we report a novel approach to evaluate lattice light shifts, specifically addressing recent discrepancies in the atomic multipolarizability term between experimental techniques and theoretical calculations. We combine imaging and multi-ensemble techniques to evaluate lattice light shift atomic coefficients, leveraging comparisons in a dual-ensemble lattice clock to rapidly evaluate differential frequency shifts. Further, we demonstrate application of a running wave field to probe both the multipolarizability and hyperpolarizability coefficients, establishing a new technique for future lattice light shift evaluations.