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We present an improvement to the cross resonance gate realized with theaddition of resonant, target rotary pulses. These pulses, applied directly tothe target qubit, are simultaneous to and in phase with the echoed crossresonance pulses. Using specialized Hamiltonian error amplifying tomography, weconfirm a reduction of error terms with target rotary -- directly translatingto improved two-qubit gate fidelity. Beyond improvement in the control-targetsubspace, the target rotary reduces entanglement between target and targetspectators caused by residual quantum interactions. We further characterizemulti-qubit performance improvement enabled by target rotary pulsing usingunitarity benchmarking and quantum volume measurements, achieving a new recordquantum volume for a superconducting qubit system.

Reducing unitary and spectator errors in cross resonance with optimized rotary echoes