Second Comment on "Contextuality within quantum mechanics manifested in subensemble mean values" [Phys. Lett. A 373 (2009) 3430]

TL;DR

This paper critiques a proposed quantum test for noncontextual models, demonstrating that a known Kochen-Specker model can explain all outcomes, thus challenging the test's conclusiveness against noncontextual realism.

Contribution

It shows that the Kochen-Specker model can account for all results in the proposed test, questioning its effectiveness in ruling out noncontextual hidden variable theories.

Findings

Kochen-Specker model explains all test outcomes

Proposed test is inconclusive against noncontextual models

Challenges the validity of the original testing proposal

Abstract

I examine Pan and Home's reply to my Comment on their proposal for testing noncontextual models. I show that the Kochen-Specker model for a qubit does explain all outcomes of a test based on such a proposal, so that it would be inconclusive about the untenability of realistic, noncontextual models.