2020

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

Sundaresan, Neereja, Lauer, Isaac, Pritchett, Emily et al.

Understand

We present an improvement to the cross resonance gate realized with the addition of resonant, target rotary pulses.

These pulses, applied directly to the target qubit, are simultaneous to and in phase with the echoed cross resonance pulses.
Using specialized Hamiltonian error amplifying tomography, we confirm a reduction of error terms with target rotary -- directly translating to improved two-qubit gate fidelity.
Beyond improvement in the control-target subspace, the target rotary reduces entanglement between target and target spectators caused by residual quantum interactions.

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