Computational Engineering of Disorder‐Free One‐Dimensional InSb Topological Superconductors

This work presents a comprehensive computational study of InSb topological superconductor nanowires (TSNWs) as promising candidates for realizing Majorana zero modes (MZMs), which are essential for the practical realization of fault‐tolerant topological quantum computing (TQC). Using a tight‐binding effective mass model and nonequilibrium Green's function formalism, electronic and quantum transport properties of disorder‐free InSb TSNWs are analyzed for various device lengths, electrochemical potentials ( μ ), and magnetic (Zeeman) fields ( V z ). Optimum operating regimes are identified where well‐localized and spatially separated MZMs emerge, as indicated by zero‐energy eigenstates, sharp peaks in the local density of states, and quantized zero‐bias conductance peaks. Coherence time and excitation time metrics are calculated to assess the viability of qubit manipulation and error suppression. It is found that disorder‐free InSb TSNWs in the 3 to 5 μm length range are technologically relevant for high‐performance TQC due to suitable MZM localization and coherence characteristics, but only if μ is negative and close in magnitude to the superconductor pairing and if V z is not set deep inside the topological phase. Our findings could provide valuable guidance for future experiments related to Majorana‐based qubits in one‐dimensional InSb hybrid systems.