Comment on `Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment', Nature Comm. 5, 4492

TL;DR

This paper argues that the quantum Cheshire Cat phenomenon can be mimicked by classical experiments and suggests that detecting cross-moments is necessary to reveal its true quantum nature.

Contribution

It demonstrates that classical analogs can reproduce the observed effects and proposes a method to distinguish genuine quantum phenomena through cross-moment measurements.

Findings

Classical experiments can mimic quantum Cheshire Cat results.

Cross-moment detection can reveal the quantum nature of the phenomenon.

The paper challenges the interpretation of previous quantum Cheshire Cat experiments.

Abstract

It is shown that a classical experiment using an ordinary cat can reproduce the same results and it is argued that the quantum nature of the phenomenon could be revealed instead by making an experiment that detects cross-moments.