No. 01
Si/SiGe中T型结的传送带模式电子穿梭Conveyor-mode electron shuttling through a T-junction in Si/SiGe
门控Si/SiGe器件中的传送带模式穿梭，能够以可扩展数量的信号线，在数微米范围内绝热转移单个电子、电子图案以及受限在量子点中的自旋量子比特。要充分发挥其潜力，线性穿梭通道必须连接成具有可控路由的二维网格。我们提出一种连接两条独立驱动穿梭通道的T型结器件。跨结的电子路由除每条传送带已有的四个通道外，无需额外控制线。在270 mm s−1的瞬时电子速度下，我们测得通道间电荷转移保真度为 $$F={100.0000000}_{-9\times 1{0}^{-7}}^{+0}\,\%$$。54个量子点的填充由简单的原子脉冲控制，这使我们能够交换电子图案，为原生自旋量子比特SWAP门奠定基础。该T型结为可扩展的二维量子计算架构开辟了道路，可实现面向量子纠错的自旋量子比特灵活路由。传送带模式电子穿梭为连接自旋量子比特提供了一条可扩展路径，但推广到二维架构需要在穿梭通道之间实现可靠路由。作者在此演示了一种硅T型结，能够在传送带模式通道之间实现接近1的保真度的单电子转移。
Abstract (English)
Conveyor-mode shuttling in gated Si/SiGe devices enables adiabatic transfer of single electrons, electron patterns and spin qubits confined in quantum dots across several microns with a scalable number of signal lines. To realize their full potential, linear shuttle lanes must connect into a two-dimensional grid with controllable routing. We introduce a T-junction device linking two independently driven shuttle lanes. Electron routing across the junction requires no extra control lines beyond the four channels per conveyor belt. We measure an inter-lane charge transfer fidelity of $$F={100.0000000}_{-9\times 1{0}^{-7}}^{+0}\,\%$$ at an instantaneous electron velocity of 270 mm s−1. The filling of 54 quantum dots is controlled by simple atomic pulses, allowing us to swap electron patterns, laying the groundwork for a native spin-qubit SWAP gate. This T-junction establishes a path towards scalable, two-dimensional quantum computing architectures with flexible spin qubit routing for quantum error correction. Conveyor-mode electron shuttling offers a scalable route to connecting spin qubits, but extension to two-dimensional architectures requires reliable routing between shuttle lanes. Here, the authors demonstrate a silicon T-junction enabling near-unity fidelity transfer of single electrons between conveyor mode channels.
Max Beer, Ran Xue, Lennart Deda, Stefan Trellenkamp, Jhih-Sian Tu, Paul Surrey, Inga Seidler, Hendrik Bluhm, Lars R. Schreiber
Nat. Commun. 17, 11453 (2026)
10.1038/s41467-026-78805-1