Neutrino oscillations provide evidence for the mode entanglement of neutrino mass eigenstates in a given flavour eigenstate. Given this mode entanglement, it is pertinent to consider the relation between the oscillation probabilities and other quantum correlations. In this work, we show that all the well-known quantum correlations, such as the Bell's inequality, are directly related to the neutrino oscillation probabilities. The results of the neutrino oscillation experiments, which measure the neutrino survival probability to be less than unity, imply Bell's inequality violation.
Alok, A. K., Banerjee, S., & Uma Sankar, S. (2016). Quantum correlations in terms of neutrino oscillation probabilities. Nuclear Physics B, 909, 65–72. https://doi.org/10.1016/j.nuclphysb.2016.05.001