Ultrafast single-qubit gates through multi-photon transition removal

Demonstrates ultrafast low-leakage control of a weakly anharmonic transmon by suppressing higher-order multiphoton transitions with recursively corrected DRAG pulses.

Key Results

• $X$ and $X/2$ gates as short as 6.8 ns with fidelities above 99.98%.
• Total leakage error consistently below $2.0\times 10^{-5}$.
• Amplified leakage-error metrology resolves coherent leakage near the $10^{-6}$ level.
• Demonstrated on a 5.323 GHz transmon with $-225$ MHz anharmonicity.

Links

• Journal: Nature Communications
• arXiv: 2511.22365

Zoo Links

• transmon