论文标题
通过优化的旋转回声减少交叉共振的单一和观众错误
Reducing unitary and spectator errors in cross resonance with optimized rotary echoes
论文作者
论文摘要
我们提出了通过添加谐振的靶旋转脉冲实现的交叉共振门的改进。这些脉冲直接应用于靶标，与回声的交叉共振脉冲同时且相位。使用专门的哈密顿误差放大层析成像，我们确认了靶标旋转的误差术语的减少 - 直接转化为改进的两Q Quition Gate Fidelity。除了对控制目标子空间的改善之外，目标旋转量还减少了由残留量子相互作用引起的目标观众之间的纠缠。我们进一步表征了通过使用单位性基准测量和量子体积测量值的目标旋转脉冲来启用的多Qubit性能改进，从而实现了超导量子系统的新记录量子体积。
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. We further characterize multi-qubit performance improvement enabled by target rotary pulsing using unitarity benchmarking and quantum volume measurements, achieving a new record quantum volume for a superconducting qubit system.
