Effect of Off-diagonal NSI Parameters on Entanglement Measurements in Neutrino Oscillations

Abstract: In this work, we explore the influence of off-diagonal non-standard interaction (NSI) parameters on quantum entanglement within the three-flavor neutrino oscillation framework. By expressing three key entanglement measures: Entanglement of Formation (EOF), Concurrence, and Negativity in terms of oscillation probabilities, we analyze how these quantum correlations are affected by the NSI parameters $\epsilon_{e\mu}$, $\epsilon_{e\tau}$, and $\epsilon_{\mu\tau}$, including their complex phases. Using the DUNE experiment as a benchmark, we find that NSI effects are most significant at low energies, with Negativity showing the highest sensitivity even at high energies. It is observed that $\epsilon_{e \mu}$ and $\epsilon_{e \tau}$ affect entanglement measures mainly through the appearance channel, while the impact of $\epsilon_{\mu \tau}$ on EOF, Concurrence, and Negativity is predominantly linked to the disappearance channel.