发表机构
Sydney Quantum Academy; Centre for Quantum Software & Information, School of Mathematical & Physical Sciences, University of Technology Sydney（悉尼量子学院; 悉尼科技大学数学与物理科学学院量子软件与信息研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对超导量子处理器低温布线设计，采用全系统数值建模进行系统优化，显著提升器件温度、噪声、量子比特容量等指标，并建立通用设计原则及配套网络工具。
AI 中文摘要
低温容量是超导量子处理器扩展中的关键瓶颈，而控制布线对其影响至关重要。目前，布线架构通常依据一小套“最佳实践”启发式规则进行设计，这些规则自早期小规模系统出现以来几乎没有变化，也未在更广泛的背景下得到严格评估。在此，我们采用全系统数值建模方法，对超导量子处理器的同轴布线设计进行了系统优化。我们确定了优化配置，这些配置在器件温度、噪声负担、量子比特容量及其他实用指标上显著优于传统设计。重要的是，我们的分析针对不同的系统环境和运行机制得出了多样化的结果，说明了在不存在通用解决方案时采用系统方法的好处。我们的结果评估并有时挑战了与设计因素相关的传统观念，例如0dB衰减器的效用。我们还利用对电缆配置的广泛探索——这直接得益于我们整体且灵活的数值建模方法——基于一个新的概念框架来描述衰减器级联，该框架借鉴了低噪声放大器链的类比，为未来低温系统设计制定了更严谨支持的一般性原则。我们的方法、设计成果和广义分析也应易于应用于其他低温量子计算平台。最后，我们通过一个基于网络的图形工具支持该方法的快速采用，该工具简化了在不同背景下对所提出框架的分析。我们的结果展示了我们的方法如何帮助在所有系统规模上最大化量子处理器的可用计算资源。
英文摘要
Cryogenic capacity is a key bottleneck in the scaling of superconducting quantum processors, critically impacted by control wiring. Currently, wiring architectures are often designed following a small set of "best-practice" heuristics, little changed since they emerged for early, small-scale systems, and not rigorously evaluated for wider contexts. Here, we adopt a whole-system numerical modelling approach and present a systematic optimisation for the coaxial wiring design of a superconducting quantum processor. We identify optimised configurations that substantively outperform conventional designs in device temperature, noise burden, qubit capacity and other practical metrics. Importantly, our analysis delivers varied outcomes for different system contexts and operating regimes, illustrating the benefits of a systematic approach when there is no universal solution. Our results evaluate and sometimes challenge conventional wisdom in relation to design factors such as the utility of 0dB attenuators. We also use a wide exploration of cable configurations---directly enabled by our holistic and flexible numerical modelling approach---to develop more rigorously supported general principles for future cryogenic system design, based on a new conceptual framework to describe attenuator cascades that draws on analogies to low-noise amplifier chains. Our approach, design outcomes, and generalised analyses should also be readily applicable to other cryogenic quantum computing platforms. Finally, we support ready adoption of this approach through a web-based graphical tool which streamlines the analysis of the proposed framework under different contexts. Our results illustrate how our approach can help maximise the available computational resources of quantum processors at all system scales.
Comments50 pages, 14 figures
