Silicon qubit fidelities approaching incoherent noise limits via pulse engineering

Understand

The performance requirements for fault-tolerant quantum computing are very stringent.

• Qubits must be manipulated, coupled, and measured with error rates well below 1%.
• For semiconductor implementations, silicon quantum dot spin qubits have demonstrated average single-qubit Clifford gate error rates that approach this threshold, notably with error rates of 0.14% in isotopically enriched $^{28}$Si/SiGe devices.
• This gate performance, together with high-fidelity two-qubit gates and measurements, is only known to meet the threshold for fault-tolerant quantum computing in some architectures when assuming that the noise is incoherent, and still lower error rates are needed to reduce overhead.