The violation of a Bell inequality is an experimental observation that forces the
abandonment of a local realistic viewpoint—namely, one in which physical properties are
(probabilistically) defined before and independently of measurement, and in which no
physical influence can propagate faster than the speed of light,. All such experimental
violations require additional assumptions depending on their specific construction, making
them vulnerable to so-called loopholes. Here we use entangled photons to violate a Bell …

A recent experiment presented, for photons, the first violation of a Bell inequality closing the
fair-sampling loophole, ie, without having to assume that the sample of measured photons
fairly represents the entire ensemble. In this note, we discuss a detailed quantum
mechanical model for the experimental data. Within experimental error the experiment
agrees with quantum mechanical prediction. We also discuss the effects of drifting laser
intensity and show that it could not have mimicked a violation of the Bell inequality …