Polshyn Hryhoriy, Naibert Tyler, Budakian Raffi
Department of Physics , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.
Department of Physics , University of California , Santa Barbara , California 93106 , United States.
Nano Lett. 2019 Aug 14;19(8):5476-5482. doi: 10.1021/acs.nanolett.9b01983. Epub 2019 Jul 1.
We demonstrate a method for manipulating small ensembles of vortices in multiply connected superconducting structures. A micron-size magnetic particle attached to the tip of a silicon cantilever is used to locally apply magnetic flux through the superconducting structure. By scanning the tip over the surface of the device and by utilizing the dynamical coupling between the vortices and the cantilever, a high-resolution spatial map of the different vortex configurations is obtained. Moving the tip to a particular location in the map stabilizes a distinct multivortex configuration. Thus, the scanning of the tip over a particular trajectory in space permits nontrivial operations to be performed, such as braiding of individual vortices within a larger vortex ensemble-a key capability required by many proposals for topological quantum computing.
我们展示了一种在多重连通超导结构中操纵小涡旋系综的方法。附着在硅悬臂尖端的微米级磁性粒子用于通过超导结构局部施加磁通量。通过在器件表面扫描尖端并利用涡旋与悬臂之间的动态耦合，获得了不同涡旋构型的高分辨率空间图。将尖端移动到图中的特定位置可稳定一种独特的多涡旋构型。因此，在空间中的特定轨迹上扫描尖端允许执行非平凡操作，例如在较大的涡旋系综中编织单个涡旋——这是许多拓扑量子计算方案所需的关键能力。
