论文标题
高保真控制的-Z门，在超导量子处理器中以最大的中间泄漏在速度限制下运行
High-fidelity controlled-Z gate with maximal intermediate leakage operating at the speed limit in a superconducting quantum processor
论文作者
论文摘要
我们介绍了通过基带频率控制transmon频率的净零方案的突然变体（SNZ）实现控制的$ z $（cz）门。 SNZ CZ门通过最大化中等泄漏，以计算状态和非计算状态之间的横向耦合的速度限制运行。 SNZ的关键优势是调整简单性，这是由于条件相的常规结构和泄漏的定期结构是两个控制参数的函数。我们意识到SNZ CZ Gates在多Transmon处理器中，达到$ 99.93 \ pm0.24 \％$ $ fidelity和$ 0.10 \ pm0.02 \％$ $ $泄漏。 SNZ与用于量子误差校正的可扩展方案兼容，并且适应通用的条件性相位门，可用于中等规模的应用。
We introduce the sudden variant (SNZ) of the Net Zero scheme realizing controlled-$Z$ (CZ) gates by baseband flux control of transmon frequency. SNZ CZ gates operate at the speed limit of transverse coupling between computational and non-computational states by maximizing intermediate leakage. The key advantage of SNZ is tuneup simplicity, owing to the regular structure of conditional phase and leakage as a function of two control parameters. We realize SNZ CZ gates in a multi-transmon processor, achieving $99.93\pm0.24\%$ fidelity and $0.10\pm0.02\%$ leakage. SNZ is compatible with scalable schemes for quantum error correction and adaptable to generalized conditional-phase gates useful in intermediate-scale applications.
