👉 The term "parseval" is a mathematical concept from quantum mechanics that refers to the energy of a particle in a state where it has a total angular momentum that is an eigenvalue. It's used in quantum field theory and quantum optics, specifically in the context of the spin-1/2 particle. In quantum physics, the spin-1/2 particle (which is often referred to as a photon) interacts with electromagnetic fields through its spin-orbit coupling. The energy levels of the spin
