Controlling Rydberg excitations using ion core transitions in alkaline earth atom tweezer arrays

TL;DR

This paper demonstrates a method to control Rydberg excitations in alkaline earth atom tweezer arrays by applying light shifts to the Rydberg state via ion core transitions, reducing photon scattering errors and enabling local gate operations.

Contribution

It introduces a novel approach of using ion core optical transitions to induce light shifts on Rydberg states, enhancing control and reducing errors in quantum computing with alkaline earth atoms.

Findings

Experimental demonstration of global Rydberg excitation control in Yb tweezer arrays.

Spectroscopy of light shifts and scattering rates reveals suppressed autoionization satellite lines.

Abstract

Scalable, local control over gate operations is an outstanding challenge in the field of quantum computing and programmable quantum simulation with Rydberg atom arrays. One approach is to use a global field to excite atoms to the Rydberg state, and tune individual atoms in and out of resonance via local light shifts. In this work, we point out that photon scattering errors from light shifts can be significantly reduced if the light shift is applied to the Rydberg state instead of the ground state, which can be realized in Rydberg states of alkaline earth atoms using optical transitions in the ion core. As a proof-of-concept, we experimentally demonstrate global control of Rydberg excitations in a Yb optical tweezer array via light shifts induced by a laser tuned near the Yb$^+$ $6s\rightarrow6p_{1/2}$ transition. We also perform detailed spectroscopy of the induced light shift and scattering rates of the $6sns$ $^3$S$_1$ Rydberg states and reveal the existence of satellite lines where losses from autoionization are strongly suppressed. This work can be readily extended to implement local gate operations in Rydberg atom arrays.