Optical cavities can provide fast and non-destructive readout of individual atomic qubits; however, scaling up to many qubits remains a challenge. Using locally addressed excited-state Stark shifts to tune atoms out of resonance, we realize site-selective hyperfine-state cavity readout across a 10-site array. The state discrimination fidelity is 0.994(1) for one atom and 0.989(2) averaged over the entire array at a survival probability of 0.975(1). To further speed up array readout, we demonstrate adaptive search strategies utilizing global/subset checks. Finally, we demonstrate repeated rounds of classical error correction, showing exponential suppression of logical error and extending logical memory fivefold beyond the single-bit idling lifetime.
@article{arxiv.2408.15329,
title = {Site-selective cavity readout and classical error correction of a 5-bit atomic register},
author = {Beili Hu and Josiah Sinclair and Edita Bytyqi and Michelle Chong and Alyssa Rudelis and Joshua Ramette and Zachary Vendeiro and Vladan Vuletić},
journal= {arXiv preprint arXiv:2408.15329},
year = {2024}
}