We show that the construction of the linear interferometer in the Supplemental Material of arXiv:1909.09581 is flawed, leading to a generally suboptimal solution. We then provide the correct derivation of the optimal interferometric configuration that achieves the quantum Fisher information limit for imaging N weak incoherent emitters.
@article{arxiv.2604.20353,
title = {Comment on "Quantum Limits to Incoherent Imaging are Achieved by Linear Interferometry"},
author = {George Brumpton and Aiman Khan and Helia Hooshmand and Samanta Piano and Gerardo Adesso},
journal= {arXiv preprint arXiv:2604.20353},
year = {2026}
}