Quantum field theory deals with the quantization of the electro-magnetic field, and finds its quantum: the photon. Electric and magnetic fields are classical fields. Can QFT quantize also them, and find their quanta? It is often said the electrons are field quanta (particles are quanta), meaning that the quanta of electric field are electrons. But electrons have mass, and I think that it is mass which distinguishes field and matter. Or does QFT suggest that fields have mass?