Qutrit and Qubit Circuits for Three-Flavor Collective Neutrino
  Oscillations
We explore the utility of qutrits and qubits for simulating the flavor
dynamics of dense neutrino systems. The evolution of such systems impacts some
important astrophysical processes, such as core-collapse supernovae and the
nucleosynthesis of heavy nuclei. Many-body simulations require classical
resources beyond current computing capabilities for physically relevant system
sizes. Quantum computers are therefore a promising candidate to efficiently
simulate the many-body dynamics of collective neutrino oscillations. Previous
quantum simulation efforts have primarily focused on properties of the
two-flavor approximation due to their direct mapping to qubits. Here, we
present new quantum circuits for simulating three-flavor neutrino systems on
qutrit- and qubit-based platforms, and demonstrate their feasibility by
simulating systems of two, four and eight neutrinos on IBM and Quantinuum
quantum computers.
Francesco Turro Ivan A. Chernyshev Ramya Bhaskar Marc Illa