Precision characterization of the state and the quadratic Zeeman coefficient in

Abstract

We report measurements of the branching fraction, hyperfine constant, and second-order Zeeman coefficient of the level in with up to a two-orders-of-magnitude reduction in uncertainty compared to previously reported values. We estimate the electric quadrupole reduced matrix element of the transition to be 12.5(4) . Furthermore, we determine the transition frequency of the at 760 nm with a 25-fold improvement in uncertainty. These measurements provide benchmarks for quantum-many-body atomic-physics calculations and provide valuable data for efforts to improve quantum information processors based on .