Dynamically corrected gates in silicon singlet-triplet spin qubits

Abstract

Fault-tolerant quantum computation requires low physical-qubit gate errors. Many approaches exist to reduce gate errors, including both hardware- and control-optimization strategies. Dynamically corrected gates are designed to cancel specific errors and offer the potential for high-fidelity gates, but they have yet to be implemented in singlet-triplet spin qubits in semiconductor quantum dots, due in part to the stringent control constraints in these systems. In this work, we experimentally implement dynamically corrected gates designed to mitigate hyperfine noise in a singlet-triplet qubit realized in a Si/SiGe double quantum dot. The corrected gates reduce infidelities by about a factor of three, resulting in gate fidelities above 0.99 for both identity and Hadamard gates. The gate performances depend sensitively on pulse distortions, and their specific performance reveals an unexpected distortion in our experimental setup.

11 pages including appendices. 11 figures

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Cited by in corpus (8)

• Quantum geometric protocols for fast high-fidelity adiabatic state transfer
• Minimal Time Robust Control for Two Superconducting Qubits
• Single-shot latched readout of a quantum dot qubit using barrier gate pulsing
• Correcting noisy quantum gates with shortcuts to adiabaticity
• An automated geometric space curve approach for designing dynamically corrected gates
• Efficient learning and optimizing non-Gaussian correlated noise in digitally controlled qubit systems
• Measuring and correcting nanosecond pulse distortions in quantum-dot spin qubits
• Hybrid acousto-optical spin control in quantum dots