EPR test with photons and kaons: Analogies

We present a unified formalism describing the Einstein–Podolsky–Rosen test using spin 12 particles, photons, and kaons. This facilitates the comparison with existing experiments using photons and kaons. It underlines the similarities between birefringence and polarization-dependent losses that affect experiments using optical fibers and mixing and decay that are intrinsic to the kaons. We also discuss the limitation these two characteristics impose on the testing of Bell’s inequality.