Closed-loop control of a GaAs-based singlet-triplet spin qubit with 99.5% gate fidelity and low leakage

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Demonstration of a fully calibrated single-qubit gate set on a GaAs singlet-triplet spin qubit reaching 99.5 % fidelity with low leakage, using closed-loop optimisation of the control pulses — an early proof that automated calibration can carry spin qubits past the fidelity levels required for error correction.

99.5 % single-qubit gate fidelity with low leakage, calibrated in a closed loop