Comment on "Multifold paths of neutrons in the three-beam interferometer detected by a tiny energy kick"

TL;DR

This paper defends the interpretation of neutron interferometry experiments, arguing that the results support a non-classical view of particle paths in nested Mach-Zehnder interferometers, countering recent criticisms.

Contribution

It provides a rebuttal to criticisms of neutron interferometry results, reaffirming the interpretation of particle paths in complex interferometer setups.

Findings

Neutron experiments support non-classical particle path interpretations

Criticism of previous optical experiments is refuted

Results reinforce the operational meaning of 'the particle's path'

Abstract

An experiment with nested Mach-Zehnder interferometer [Phys. Rev. Lett. 111, 240402 (2013)] has been recently implemented with neutrons [Phys. Rev. A 97, 052111 (2018)]. Which-path information has been extracted from faint traces the neutrons left, providing operational meaning to "the particle's path". The authors of the neutron interference experiment criticised the conclusions obtained by the authors of the optical experiment. I refute the criticism and argue that the results of the neutron interference experiment actually support the surprising picture of the past of the particle in the nested Mach-Zehnder interferometer.