Rydberg electrometry for optical lattice clocks

Abstract

Electrometry is performed using Rydberg states to evaluate the quadratic Stark shift of the 5s2S01-5s5pP03 clock transition in strontium. By measuring the Stark shift of the highly excited 5s75dD21 state using electromagnetically induced transparency, we characterize the electric field with sufficient precision to provide tight constraints on the systematic shift to the clock transition. Using the theoretically derived, and experimentally verified, polarizability for this Rydberg state, we can measure the residual field with an uncertainty well below 1 Vm-1. This resolution allows us to constrain the fractional frequency uncertainty of the quadratic Stark shift of the clock transition to 2×10-20.