Characterizing coherent errors using matrix-element amplification

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Jonathan A. Gross, Élie Genois, Dripto M. Debroy, Yaxing Zhang, Wojciech Mruczkiewicz, Ze-Pei Cian, Zhang Jiang
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引用次数: 0

Abstract

Repeating a gate sequence multiple times amplifies systematic errors coherently, making it a useful tool for characterizing quantum gates. However, the precision of such an approach is limited by low-frequency noise, while its efficiency is hindered by time-consuming scans required to match up the phases of the off-diagonal matrix elements being amplified. Here, we overcome both challenges by interleaving the gate of interest with dynamical decoupling sequences in a protocol we call Matrix-Element Amplification using Dynamical Decoupling (MEADD). Using frequency-tunable superconducting qubits from a Google Sycamore quantum processor, we experimentally demonstrate that MEADD surpasses the accuracy and precision of existing characterization protocols for estimating systematic errors in single- and two-qubit gates. We use MEADD to estimate coherent parameters of CZ gates with 5 to 10 times the precision of existing methods and to characterize previously undetectable coherent crosstalk, reaching a precision below one milliradian.

Abstract Image

利用矩阵元素放大技术确定相干误差的特征
多次重复门序列可以连贯地放大系统误差,因此是表征量子门的有用工具。然而,这种方法的精度受到低频噪声的限制,而其效率则受到耗时的扫描的阻碍,因为需要匹配被放大的非对角矩阵元素的相位。在这里,我们克服了这两项挑战,在我们称为 "使用动态去耦的矩阵元素放大"(MEADD)的协议中,将相关门与动态去耦序列交错在一起。利用谷歌 Sycamore 量子处理器中的频率可调超导量子比特,我们通过实验证明,MEADD 在估算单量子比特和双量子比特门的系统误差方面,超越了现有表征协议的准确性和精确度。我们使用 MEADD 估算 CZ 门的相干参数,其精度是现有方法的 5 到 10 倍,并表征了以前无法检测到的相干串扰,精度低于 1 毫弧度。
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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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