Site-selective cavity readout and classical error correction of a 5-bit atomic register

Understand

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.