发表机构
QuTech and Kavli Institute of Nanoscience, Delft University of Technology（代尔夫特理工大学量子技术与卡弗里纳米科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在6×6量子点阵列中通过相干自旋穿梭实现稀疏量子比特配置，降低串扰42倍，支持高保真单比特及控制-Z操作，为二维扩展和高连接量子电路提供途径。
AI 中文摘要
容错量子计算要求在保持高性能和连接性的同时增加量子比特数量。半导体量子比特已展示出高保真度操作，但在足够连接性下扩展系统规模仍具挑战性，因此扩展主要沿一个空间方向进行，以在另一方向保留控制线的访问空间。在此，我们实现了一种放宽制造要求的方法，并展示了一个由共享势垒栅极和独立柱塞栅极定义的6$\ imes$6量子点阵列。通过相干自旋穿梭，量子点被调谐至距离达5.2微米的稀疏配置，包含10个同时操作的量子比特，为穿梭连接留出空间。在此分离区域中，我们将串扰降低了42倍，实现了高保真度的同时单量子比特控制，而控制-Z操作可通过穿梭和仅柱塞控制实现。这些结果预示着通过扩展到二维几何结构并利用穿梭技术，可实现高连接性的量子电路。
英文摘要
Fault-tolerant quantum computation requires increasing the qubit count while maintaining high performance and connectivity. Semiconductor qubits have demonstrated high-fidelity operation, but growing the system size at sufficient connectivity remains challenging, such that scaling mainly occurred in one spatial direction to preserve access for control lines in the other. Here, we realise an approach that relaxes the requirements on fabrication and demonstrate a 6$\times$6 quantum dot array, defined by a shared barrier gate and individual plunger gates. The quantum dots are tuned through coherent spin shuttling over distances up to 5.2um into a sparse configuration of 10 simultaneously operated qubits, leaving space for shuttling connections. We reduce crosstalk by 42$\times$ in this separated regime, enabling high-fidelity simultaneous single-qubit control, while control-Z operations can be implemented through shuttling and plunger-only control. These results promise high-connectivity quantum circuits, enabled by scaling to two-dimensional geometries and exploiting shuttling.
CommentsMain: 11 pages, 5 figures. Supplementary Information: 17 pages
