Reproducibility of the reported parity readout across TGP-passing regions

Determine whether the interferometric single-shot parity measurement (parity readout) reported in Microsoft Quantum, Nature 638, 651–655 (2025), is reproducible in other gate-voltage and magnetic-field regions within the same devices that also pass the topological gap protocol (TGP), and provide a clear justification for why the specific regions presented were selected over other TGP-passing regions.

Background

The comment analyzes the reliance on the topological gap protocol (TGP) to identify parameter regions where parity readout measurements were performed. It shows that multiple regions, particularly in Device B, passed the TGP but were not explored, contradicting claims that only a single region passed within the explored range.

Because reproduction was not performed in these additional TGP-passing regions, the question of reproducibility and the rationale for selecting the presented regions remains unresolved. Establishing reproducibility is central to validating the claimed parity readout effect.