发表机构
Argonne National Laboratory; memQ Inc.（阿贡国家实验室; memQ公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出基于8-DAM架构的异构距离晶格手术，通过扩大中央辅助块并利用移动稳定子抑制钩子错误，在减少量子比特开销的同时实现与均匀码距相当的逻辑错误抑制，并支持双分布式CNOT操作。
AI 中文摘要
分布式量子计算需要跨QPU间链路的容错操作，这些链路可能比本地门噪声大得多。均匀增加码距能提供额外保护，但也会扩大用于本地存储和计算的数据块。在此，我们引入使用八数据块辅助中介（8-DAM）架构的分布式异构距离晶格手术，该架构对近期量子设备有用且量子比特开销更少。在此架构中，跨越QPU间边界的中央辅助块被扩大，而数据块保持距离$d$。该协议使用移动稳定子来抑制这些不等距离块之间合并和分裂操作期间的钩子错误。在固定局部去极化噪声下对旋转表面码的电路级模拟表明，逻辑读出错误率仅弱依赖于链路噪声。与传统晶格手术相比，其优势随着链路错误的增加而增长。与均匀距离实现的比较表明，在减少物理量子比特开销的同时，实现了相当的逻辑错误抑制。我们还展示了8-DAM布局如何支持使用单个扩大辅助块在四个逻辑数据量子比特之间进行两个同时的分布式逻辑CNOT操作。在更高的链路噪声下，这种构造比两个独立的分布式逻辑CNOT产生更低的逻辑错误率和更高的稳定性。这些结果支持选择性扩大辅助块作为容错分布式量子计算的资源高效方法。
英文摘要
Distributed quantum computing requires fault-tolerant operations across inter-QPU links that can be substantially noisier than local gates. Uniformly increasing code distance provides additional protection but also enlarges data patches used for local storage and computation. Here, we introduce distributed heterogeneous-distance lattice surgery using an eight-data-patch ancilla-mediated (8-DAM) architecture, which will be useful for near-term quantum devices with less qubit overhead. In this architecture, the central ancilla spanning the inter-QPU boundary is enlarged while the data patches retain distance $d$. The protocol uses traveling stabilizers to suppress hook errors during merge and split operations between these unequal-distance patches. Circuit-level simulations of rotated surface codes at fixed local depolarizing noise show that logical-readout error rates depend only weakly on link noise. The resulting advantage over conventional lattice surgery grows as link errors increase. Comparisons with uniform distance implementations demonstrate comparable logical error suppression with reduced physical-qubit overhead. We also demonstrate how 8-DAM layouts support two simultaneous distributed logical CNOT operations between four logical data qubits using a single enlarged ancilla. At higher link noise, this construction yields lower logical error rates and more stability than two independent distributed logical CNOTs. These results support selective ancilla enlargement as a resource-efficient approach to fault-tolerant distributed quantum computing.
