Asking photons where they have been in plain language

TL;DR

This paper challenges a previous claim by Phys. Rev. Lett. that photons do not have continuous trajectories, demonstrating through standard quantum mechanics that such a conclusion is incorrect.

Contribution

The paper provides a straightforward analysis showing that the previous assertion about photon trajectories is false, clarifying misconceptions about photon paths.

Findings

The claim that photons lack continuous trajectories is incorrect.

Standard quantum mechanics supports the existence of continuous photon paths.

The analysis refutes previous interpretations about photon 'past' in quantum experiments.

Abstract

The authors of Phys.Rev.Lett. \textbf{111}, 240402 (2013) conclude that "the past of the photons is not represented by continuous trajectories". A simple analysis by standard quantum mechanics shows that this claim is false.