Comment on "Which-way information in a nested Mach-Zehnder interferometer"

TL;DR

This paper defends the interpretation of photon paths in a nested Mach-Zehnder interferometer against recent criticism, reaffirming the original experimental conclusions about photon behavior and path discontinuities.

Contribution

It provides a rebuttal to recent critiques, supporting the original analysis of photon trajectories in the interferometer experiment.

Findings

Criticism of the original interpretation is unfounded.

Experimental evidence supports disconnected photon paths.

The debate clarifies interpretations of quantum interferometry.

Abstract

Potocek and Ferenczi [Phys. Rev. A 92, 023829 (2015)] provided an analysis of the experimental evidence obtained by Danan et al. [Phys. Rev. Lett. 111, 240402 (2013)] for the surprising behaviour of photons passing through an interferometer, in particular, motion on disconnected paths. Potocek and Ferenczi reproduced the results of the experiment, but when analyzing its modification, they claimed that the reasoning of Danan et al., which led to disconnected paths, is erroneous. It is argued here that the criticism of Potocek and Ferenczi is unfounded.