Procedure for systematically tuning up crosstalk in the cross resonance gate

Understand

We present improvements in both theoretical understanding and experimental implementation of the cross resonance (CR) gate that have led to shorter two-qubit gate times and interleaved randomized benchmarking fidelities exceeding 99%.

• The CR gate is an all-microwave two-qubit gate offers that does not require tunability and is therefore well suited to quantum computing architectures based on 2D superconducting qubits.
• The performance of the gate has previously been hindered by long gate times and fidelities averaging 94-96%.
• We have developed a calibration procedure that accurately measures the full CR Hamiltonian.