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We demonstrate mid-circuit measurements in a neutral atom array by shelvingdata qubits in protected hyperfine-Zeeman sub-states while non-destructivelymeasuring an ancilla qubit. Measurement fidelity was enhanced using microwaverepumping of the ancilla during the measurement. The coherence of the shelveddata qubits was extended during the ancilla readout with dynamical decouplingpulses, after which the data qubits are returned to mf = 0 computational basisstates. We demonstrate that the quantum state of the data qubits is wellpreserved up to a constant phase shift with a state preparation and measurement(SPAM) corrected process fidelity of F = 97.0(5)%. The measurement fidelity onthe ancilla qubit after correction for state preparation errors is F = 94.9(8)%and F = 95.3(1.1)% for |0> and |1> qubit states, respectively. We discussextending this technique to repetitive quantum error correction usingquadrupole recooling and microwave-based quantum state resetting.

Mid-circuit measurements on a single species neutral alkali atom quantum processor