Comment on "InAs-Al hybrid devices passing the topological gap protocol", Microsoft Quantum, Phys. Rev. B 107, 245423 (2023)
The topological gap protocol (TGP), used by Microsoft Quantum to test for topological superconductivity in InAs-Al hybrid devices, is found to be unreliable. The protocol lacks a consistent definition of 'gap' and varies significantly based on experimental settings like magnetic field range and data resolution. This sensitivity suggests the reported claims about the devices being in a topological phase are based on measurement choices rather than intrinsic device properties.