AI 中文总结
该研究通过X射线纳米结构 mapping 分析英特尔Si/SiGe芯片，揭示了SiGe生长引入的晶格缺陷对量子比特能谱的影响，明确了衬底 miscut 与交叉 hatch 图案的关联，为量子比特性能优化提供了依据。
AI 中文摘要
半导体量子比特是量子计算的理想载体，其特性由宿主晶格决定。占据导带局域最低能态的量子点自旋必然与结构无序和界面耦合。硅基系统兼具低噪声与工业兼容的制造优势，但作为主流平台的SiGe生长过程不可避免地引入位错、非均匀应变和交叉 hatch 图案，预计会导致器件间波动、量子比特失效，进而提升运行成本。通过对英特尔Si/SiGe芯片的X射线纳米结构 mapping，我们以30nm横向分辨率和200nm功能深度分辨率，揭示了生长过程中引入的扩展晶格缺陷如何在异质结构中传播，形成永久畸变的晶格平面和应变。我们在约1μm的量子点器件尺度上关联这些缺陷，并计算其对量子比特能谱的影响。我们观测到交叉 hatch 精细结构，发现衬底 miscut 与生长过程和最终交叉 hatch 图案存在相关性。
英文摘要
Semiconductor qubits, promising for quantum computation, inherit properties from their host lattice. Quantum dot spins, occupying the local lowest energy states in the conduction band, necessarily couple to structural disorder and interfaces. While silicon-based systems promise low noise alongside industrially compatible manufacturing, the growth of SiGe---a leading platform---unavoidably introduces lattice dislocations, inhomogeneous strain, and crosshatch patterns, expected to cause fluctuations between devices, qubit failure, and subsequently higher operational overhead. Through X-ray nano-structural mapping of an Intel Si/SiGe chip, we reveal, with 30$~$nm lateral and 200$~$nm functional depth resolution, how extended lattice defects introduced during growth propagate through the heterostructure, creating permanently distorted lattice planes and strain. We correlate these at the $\approx1~μ$m scale of a quantum dot device and calculate the impact on qubit energy spectra. We observe crosshatch fine structure and find that substrate miscut and growth correlate with the final crosshatch pattern.
Comments14 pages, 5 main text figures and 6 supplemental figures
