Bosonic bunching does not reveal stronger quantum contextuality

TL;DR

The paper critiques recent claims that bosonic bunching experiments can demonstrate stronger quantum contextuality, arguing that the experimental setups do not meet the necessary conditions for such violations.

Contribution

It clarifies the conditions required for observing quantum contextuality and refutes claims that bosonic bunching experiments violate these conditions.

Findings

Claims of violating NC inequalities are unfounded due to experimental setup issues.

Physical events in the experiments lack the assumed exclusivity relationships.

Theoretical analysis shows no violation of quantum contextuality in the discussed experiments.

Abstract

In a recent paper, Kurzynski et al. present a gedanken experiment that, they claim, violates the Klyachko-Can-Binicioglu-Shumovsky (KCBS) noncontextuality (NC) inequality beyond its maximum quantum value, and a similar experiment that, they claim, violates Specker's NC inequality, which is not violated by quantum mechanics. We argue that these claims are baseless, since these experiments do not satisfy the conditions required for any observation of contextuality through the experimental violation of a NC inequality. Moreover, the physical events in the experiments of Kurzynski et al. do not have the relationships of exclusivity which the authors assume they have.