Experimental error suppression in Cross-Resonance gates via multi-derivative pulse shaping

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Boxi Li, Tommaso Calarco, Felix Motzoi
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引用次数: 0

Abstract

While quantum circuits are reaching impressive widths in the hundreds of qubits, their depths have not been able to keep pace. In particular, cloud computing gates on multi-qubit, fixed-frequency superconducting chips continue to hover around the 1% error range, contrasting with the progress seen on carefully designed two-qubit chips, where error rates have been pushed towards 0.1%. Despite the strong impetus and a plethora of research, experimental demonstration of error suppression on these multi-qubit devices remains challenging, primarily due to the wide distribution of qubit parameters and the demanding calibration process required for advanced control methods. Here, we achieve this goal, using a simple control method based on multi-derivative, multi-constraint pulse shaping, which acts simultaneously against multiple error sources. Our approach establishes a two to fourfold improvement on the default calibration scheme, demonstrated on four qubits on the IBM Quantum Platform with limited and intermittent access, enabling these large-scale fixed-frequency systems to fully take advantage of their superior coherence times. The achieved CNOT fidelities of 99.7(1)% on those publically available qubits come from both coherent control error suppression and accelerated gate time.

Abstract Image

通过多衍生脉冲整形抑制交叉谐振门的实验误差
虽然量子电路的宽度达到了令人印象深刻的数百量子比特,但其深度却未能跟上步伐。特别是多量子比特、固定频率超导芯片上的云计算门,误差仍然徘徊在1%左右,这与精心设计的双量子比特芯片所取得的进展形成鲜明对比,后者的误差率已接近0.1%。尽管有强大的推动力和大量的研究,但在这些多量子比特器件上进行误差抑制的实验演示仍然具有挑战性,这主要是由于量子比特参数的广泛分布以及先进控制方法所需的苛刻校准过程。在这里,我们利用一种基于多衍生、多约束脉冲整形的简单控制方法实现了这一目标,该方法可同时针对多个误差源发挥作用。我们的方法在默认校准方案的基础上实现了两到四倍的改进,并在 IBM 量子平台上的四个量子比特上进行了有限的间歇性访问演示,使这些大型固定频率系统能够充分利用其卓越的相干时间。在这些公开的量子比特上实现了 99.7(1)% 的 CNOT 保真度,这得益于相干控制误差抑制和加速的门时间。
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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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