Cavity-Coupled Neutral Atom Array Part 1: Site-selective Cavity Readout

Neutral atom arrays coupled to optical cavities have emerged as a powerful platform for quantum information science. Optical cavities facilitate fast and non-destructive readout of individual atomic qubits. However, scaling to large qubit arrays remains a challenge. By employing locally addressed excited-state Stark shifts to detune atoms from resonance, we achieve site-selective hyperfine-state cavity readout across a 10-site array. The state discrimination fidelity reaches 0.994(1) for a single atom and averages 0.989(2) across the entire array, with a survival probability of 0.975(1). These advancements pave the way towards fault-tolerant quantum computing by enabling repeated rounds of error correction.