标题： 抑制硅谷激发和谷诱导的自旋退相干用于远距离传输 显示英文标题

标题： Suppressing Si Valley Excitation and Valley-Induced Spin Dephasing for Long-Distance Shuttling

摘要： 我们提出了一种可扩展的协议，用于在硅量子点中电子自旋转移过程中抑制误差。 该方法将谷哈密顿量映射到Landau-Zener问题，以模拟小谷分裂区域中的非绝热动力学。 优化过程对转移路径上的一个小型区段的转移速度轮廓进行调整。 在转移结束时，该协议可靠地将谷态返回到基态，分离自旋和谷自由度，之后对自旋进行一次虚拟的$z$-旋转以补偿转移过程中的演化。 误差抑制的时间成本和复杂度最小，并且与自旋转移的距离无关，由谷物理施加的最大速度被发现比目前实验上可实现的转移速度大几个数量级。 该协议为基于硅的量子计算设备中的高保真量子传输提供了一个芯片级解决方案。 显示英文摘要

摘要： We present a scalable protocol for suppressing errors during electron spin shuttling in silicon quantum dots. The approach maps the valley Hamiltonian to a Landau-Zener problem to model the nonadiabatic dynamics in regions of small valley splitting. An optimization refines the shuttling velocity profile over a single small segment of the shuttling path. The protocol reliably returns the valley state to the ground state at the end of the shuttle, disentangling the spin and valley degrees of freedom, after which a single virtual $z$-rotation on the spin compensates its evolution during the shuttle. The time cost and complexity of the error suppression is minimal and independent of the distance over which the spin is shuttled, and the maximum velocities imposed by valley physics are found to be orders of magnitude larger than current experimentally achievable shuttling speeds. This protocol offers a chip-scale solution for high-fidelity quantum transport in silicon spin-based quantum computing devices.