Electron spin qubits in silicon quantum dots (QDs) are a promising solid-state system for quantum computing. To achieve fault-tolerant quantum computation, constructing high-fidelity and robust quantum gates to meet the stringent requirements is an important issue. We aim to develop such technology to construct robust quantum gates with fault-tolerant gate fidelities for the QD spin-qubit system.

Our control technique, by designing the optimized control pulses, can effectively reduce the gate infidelity over an order of magnitude and also enlarge the robust windows against the noise and the system parameter uncertainty as compared to the current experimental method for the quantum-dot spin qubits.

The techniques we developed can be applied to realistic devices to realize the high-fidelity and robust quantum gates experimentally, and to effectively increase the reliable circuit depth on noisy intermediate-scale quantum (NISQ) computing machines. Furthermore, we will also extend these techniques to multi-qubit gate control, paving the way for large-scale fault-tolerant quantum computing.