Comment on "Resurgence of Rayleigh's curse in the presence of partial coherence"

TL;DR

This paper refutes previous claims that Rayleigh's curse reappears with partial coherence, demonstrating that spatial-mode demultiplexing (SPADE) can still overcome it in such cases.

Contribution

The authors identify fundamental issues in prior work and establish that SPADE remains effective against Rayleigh's curse even with partially coherent sources.

Findings

SPADE can overcome Rayleigh's curse with partial coherence

Previous calculations on partial coherence and Rayleigh's curse are flawed

Rayleigh's curse is not unavoidable with partial coherence when using SPADE

Abstract

Larson and Saleh [Optica 5, 1382 (2018)] suggest that Rayeleigh's curse can recur and become unavoidable if the two sources are partially coherent. Here we show that their calculations and assertions have fundamental problems, and spatial-mode demultiplexing (SPADE) can overcome Rayleigh's curse even for partially coherent sources.