  Flavor oscillations in elementary particle physics are related to multi-mode
entanglement of single-particle states. We show that mode entanglement can be
expressed in terms of flavor transition probabilities, and therefore that
single-particle entangled states acquire a precise operational characterization
in the context of particle mixing. We treat in detail the physically relevant
cases of two- and three-flavor neutrino oscillations, including the effective
measure of CP violation. We discuss experimental schemes for the transfer of
the quantum information encoded in single-neutrino states to spatially
delocalized two-flavor charged lepton states, thus showing, at least in
principle, that single-particle entangled states of neutrino mixing are
legitimate physical resources for quantum information tasks.
