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This comment critiques the interpretation of recent studies on the Bell-CHSH parameter.

December 8, 2025Physical review. A/Physical review, A1 citationsOpen Access

Comment on “Consequences of the single-pair measurement of the Bell parameter”

JLJusto Pastor LambareUniversidad Nacional de Asunción

Key Points

This comment critiques the interpretation of recent studies on the Bell-CHSH parameter.
Analysis of claims made by Genovese and Piacentini on Bell-CHSH parameter measurements.
Evaluation of the implications of these measurements for loophole-free tests.
The Bell-CHSH inequality does not rely on the entire Bell parameter.
Recent experiments do not relate to empirical tests that could close loopholes.

Abstract

In a recent article , Genovese and Piacentini analyzed recent experiments measuring what they call “the entire Bell-Clauser-Horne-Shimony-Holt (Bell-CHSH) parameter.” They claimed those experiments may have implications for interpreting loophole-free tests of the Bell-CHSH inequality. We explain that the Bell-CHSH inequality is not based on the entire Bell parameter, so these experiments are unrelated to their empirical tests and cannot close any eventual loopholes that might still persist. We point out that the physical meaning of these new experiments measuring the entire Bell parameter could be interpreted differently.

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