Integrating micromagnets and hybrid nanowires for topological quantum computing

Majorana zero modes are expected to arise insemiconductor-superconductor hybrid systems, with potential topologicalquantum computing applications. One limitation of this approach is theneed for a relatively high external magnetic field that should alsochange direction at the nanoscale. This proposal considers devices thatincorporate micromagnets to address this challenge. We perform numericalsimulations of stray magnetic fields from different micromagnetconfigurations, which are then used to solve for Majorana wavefunctions.Several devices are proposed, starting with the basic four-magnet designto align magnetic field with the nanowire and scaling up to nanowireT-junctions. The feasibility of the approach is assessed by performingmagnetic imaging of prototype patterns.