Why do neutrinos suddenly swap flavors? Quantum entanglement holds the answer.

Neutrinos in dense environments (like supernovae cores) undergo sudden flavor oscillations called spectral splits. Using tensor network simulations, researchers found these splits occur exactly where entanglement entropy peaks but quantum magic dips—revealing the splits aren't driven by generic resource growth but by a structured reshuffling of resources between flavor modes. This links quantum complexity measures to observable phenomena.