AI 中文总结
本研究实现了单个与Ti原子交换耦合的Er电子自旋的全电控相干操控，利用扫描隧道显微镜电子自旋共振揭示其各向异性，使拉比频率提升10倍，为稀土自旋操控开辟新路径。
AI 中文摘要
单自旋量子比特的电操控是纳米级、高速、可扩展量子器件的重要前沿方向，然而将其拓展至高度屏蔽的稀土4f电子仍是固态平台面临的实验挑战。本文展示了对单个Er电子自旋的全电控相干操控，该自旋与附近Ti原子交换耦合。基于扫描隧道显微镜的电子自旋共振结合三维磁场操控，可全面测绘共振频率和拉比频率，揭示了Er g张量及Er-Ti交换相互作用的显著各向异性。对各向异性Er-Ti耦合的电调制可实现Er自旋的高效驱动，使拉比频率达到近吉赫兹，较当前稀土自旋量子比特的记录提升了10倍。通过确立各向异性交换作为电操控屏蔽稀土自旋的通用资源，本研究为固态量子器件中稀土自旋的超快、局域操控开辟了新路径。
英文摘要
Electrical control of single spin qubits is a major frontier for nanoscale, high-speed, and scalable quantum devices. Yet, extending it to highly shielded rare-earth 4f electrons remains an experimental challenge across solid-state platforms. Here we demonstrate all-electrical coherent control of a single Er electron spin, which is exchange-coupled to a nearby Ti atom. Scanning tunneling microscopy-based electron spin resonance with three-dimensional magnetic-field control enables comprehensive mapping of the resonance and Rabi frequencies, revealing pronounced anisotropies in both the Er g-tensor and the Er-Ti exchange interaction. The electrical modulation of the anisotropic Er-Ti coupling results in an efficient drive of the Er spin, allowing us to achieve near-gigahertz Rabi frequencies - a ten-fold improvement over the present record for rare-earth spin qubits. By establishing anisotropic exchange as a general resource for electrically accessing shielded rare-earth spins, our results open a new route to ultrafast and local control of rare-earth spins in solid-state quantum devices.
