Comment on "Nonlocal Coherent Perfect Absorption"

TL;DR

This paper refutes previous claims of nonlocal coherent absorption in a specific setup, demonstrating that the observed absorption is actually local rather than nonlocal.

Contribution

It clarifies the nature of absorption in the setup, correcting prior misconceptions about nonlocal effects in lossy beam splitters.

Findings

No evidence of nonlocal coherent absorption in the considered setup

Absorption occurs locally at the lossy beam splitters

Previous claims of nonlocal effects are incorrect

Abstract

We show that, contrary to what is claimed in Ref. [J. Jeffers, Phys. Rev. Lett. 123, 143602 (2019)], there is no nonlocal coherent absorption by the two lossy beam splitters considered in detail in the treatment of the setup presented in this reference. What happens is a local coherent absorption by the other two lossy beam splitters of the setup.