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arXiv 2407.20184quant-phphysics.atom-ph
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高保真里德堡纠缠门的基准测试与保真度响应理论

Benchmarking and fidelity response theory of high-fidelity Rydberg entangling gates

Richard Bing-Shiun Tsai, Xiangkai Sun, Adam L. Shaw, Ran Finkelstein, Manuel Endres

备注：
RBST and XS contributed equally to this work
发表信息：
PRX Quantum 6, 010331 (2025)
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AI总结：

本文实现并基准测试时间最优里德堡 CZ 门，获得 0.9971(5) 的平均保真度，并提出保真度响应理论以建模激光噪声、优化门协议及预测 0.999 以上保真度。

摘要：

纠缠操作的保真度是量子信息处理中的一项关键性能指标，尤其是在量子纠错背景下。近年来，中性原子中的高保真纠缠门取得了显著进展。全面理解误差来源及其对门失真度的各自贡献，将有助于在现实实验约束下预测中性原子平台中量子门的基本极限。在本工作中，我们实现了时间最优的里德堡 CZ 门，设计了一个电路来基准测试其保真度，并在对泄漏误差进行向下修正后，获得了在对称输入态上平均为 0.9971(5) 的保真度；这与我们近期的工作共同构成了中性原子领域的最新最高水平。剩余的失真度由一个从头算误差模型解释，该模型在一系列门速度范围内与我们的实验结果一致，且不同误差来源具有不同贡献。此外，我们发展了一种保真度响应理论，可高效预测具有非平凡功率谱密度的激光噪声导致的失真度，并推导了失真度随门速度变化的标度律。除了预测门保真度的能力外，我们还利用保真度响应理论来比较和优化门协议、学习激光频率噪声，以及研究量子模拟任务中的噪声响应。最后，我们预测，通过现实可行的实验升级，实现大于或等于 0.999 的 CZ 门保真度是可行的。

英文摘要：

The fidelity of entangling operations is a key figure of merit in quantum information processing, especially in the context of quantum error correction. High-fidelity entangling gates in neutral atoms have seen remarkable advancement recently. A full understanding of error sources and their respective contributions to gate infidelity will enable the prediction of fundamental limits on quantum gates in neutral atom platforms with realistic experimental constraints. In this work, we implement the time-optimal Rydberg CZ gate, design a circuit to benchmark its fidelity, and achieve a fidelity, averaged over symmetric input states, of 0.9971(5), downward-corrected for leakage error, which together with our recent work forms a new state-of-the-art for neutral atoms. The remaining infidelity is explained by an ab initio error model, consistent with our experimental results over a range of gate speeds, with varying contributions from different error sources. Further, we develop a fidelity response theory to efficiently predict infidelity from laser noise with non-trivial power spectral densities and derive scaling laws of infidelity with gate speed. Besides its capability of predicting gate fidelity, we also utilize the fidelity response theory to compare and optimize gate protocols, to learn laser frequency noise, and to study the noise response for quantum simulation tasks. Finally, we predict that a CZ gate fidelity of ${\gtrsim} 0.999$ is feasible with realistic experimental upgrades.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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