  Quantum information theory has recently emerged as a flourishing area of
research and quantum complexity, one of its powerful measures, is being applied
for investigating complex systems in many areas of physics. Its application to
practical physical situations, however, is still few and far between. Neutrino
flavor oscillation is a widely studied physical phenomena with far reaching
consequences in understanding the standard model of particle physics and to
search for physics beyond it. Oscillation arises because of mixing between the
flavor and mass eigenstates, and their evolution over time. It is an inherent
quantum system for which flavor transitions are traditionally studied with
probabilistic measures. We have applied quantum complexity formalism as an
alternate measure to study neutrino oscillations. In particular, quantum spread
complexity revealed additional information on the violation of charge-parity
symmetry in the neutrino sector. Our results indicate that complexity favors
the maximum violation of charge-parity, hinted recently by experimental data.
