Integrating micromagnets and hybrid nanowires for topological quantum computing

Abstract

Majorana zero modes are expected to arise in semiconductor-superconductor hybrid systems, with potential topological quantum computing applications. One limitation of this approach is the need for a relatively high external magnetic field that should also change direction at nanoscale. This proposal considers devices that incorporate micromagnets to address this challenge. We perform numerical simulations of stray magnetic fields from different micromagnet configurations, which are then used to solve for Majorana wavefunctions. Several devices are proposed, starting with the basic four-magnet design to align magnetic field with the nanowire and scaling up to nanowire T-junctions. The feasibility of the approach is assessed by performing magnetic imaging of prototype patterns.

This version responds to second round of SciPost referee feedback. Changes highlighted in the ancillary version. Ancillary folder also contains the Block Method draft of the paper. Data and code available on GitHub and Zenodo

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Cited by in corpus (11)

• Majorana nanowires for topological quantum computation
• First Principles Assessment of CdTe as a Tunnel Barrier at the $\alpha$-Sn/InSb Interface
• Topological superconductivity in a magnetic-texture coupled Josephson junction
• Optimal design of nanomagnets for on-chip field gradients
• Zero-bias conductance peaks at zero applied magnetic field due to stray fields from integrated micromagnets in hybrid nanowire quantum dots
• Spin-helical detection in a semiconductor quantum device with ferromagnetic contacts
• Giant resonant skew scattering of plasma waves in a two-dimensional electron gas
• Majorana Braiding Racetracks from Charge Chern Insulator - Superconductor Hybrids
• Odd-frequency Pairing in Josephson Junctions Coupled by Magnetic Textures
• Nanoscale stray fields from micromagnets for optimal spin qubit architecture
• Predicted third-order sweet spots for phi-junction Josephson parametric amplifiers