Comments on "An experimental test of non-local realism" by S. Groeblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, Nature 446 (2007), 871-875

TL;DR

This paper provides a straightforward proof of a key inequality from the original experiment testing non-local realism, offers an introductory discussion of the setup, and proposes an alternative statistical analysis approach.

Contribution

It introduces a simple proof of the critical inequality, clarifies the experimental setup, and suggests an alternative statistical analysis method.

Findings

Proof of the key inequality is simplified.

Clarification of the experimental setup.

Proposal of an alternative statistical analysis.

Abstract

A simple proof of a key inequality required by the paper's analysis is presented. An introductory section discussing the paper's setup may be helpful to some readers. An alternative statistical analysis is suggested.