We propose methods to mitigate single- and two-qubit control errors due to residual exchange coupling in systems of exchange-coupled resonant singlet-triplet qubits. Commensurate driving, where the pulse length is an integer multiple of the drive period, can mitigate errors from residual intraqubit exchange, including effects from counter-rotating terms and off-axis rotations, as well as leakage errors during two-qubit operations. Residual interqubit exchange creates crosstalk errors that reduce single-qubit control fidelities. We show that using a single-spin coupler between two resonant singlet-triplet qubits can reduce this crosstalk error by an order of magnitude. Assuming perfect coupler state preparation and realistic charge and hyperfine noise, we predict that coupler-assisted two-qubit gate errors can be below $3\times {10}^{-3}$ for gate times as short as $66\mathrm{ns}$, even in the presence of residual exchange levels exceeding several hundred kHz. Our results suggest the potential of utilizing coupler-based architectures for large-scale fault-tolerant spin qubit processors based on resonant singlet-triplet qubits.

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• Exchange interaction
• Quantum control
• Quantum fluctuations & noise
• Quantum gates
• Quantum information with solid state qubits
• Quantum dot qubits
• Spin qubits
• Microwave techniques