Diabatic gates for frequency-tunable superconducting qubits

Understand

We demonstrate diabatic two-qubit gates with Pauli error rates down to $4.3(2)\cdot 10^{-3}$ in as fast as 18 ns using frequency-tunable superconducting qubits.

• This is achieved by synchronizing the entangling parameters with minima in the leakage channel.
• The synchronization shows a landscape in gate parameter space that agrees with model predictions and facilitates robust tune-up.
• We test both iSWAP-like and CPHASE gates with cross-entropy benchmarking.