Reconsideration of Quantization of Photon Fields

Abstract

The quantization of free photon fields based on our new formalism is reconsidered. The creation and annihilation operators for photons are introduced. Expanding the photon fields in the plane waves, the equal-time commutation relations for the creation and annihilation operators are obtained. The number of photons and the momentum of the system are expressed by the creation and annihilation operators. The conservation of these quantities is also shown. Finally, we obtain the Hamiltonian of the system. The absence of the zero-point energy term in the Hamiltonian is found. Our conclusion is consistent with that of Barut and his co-workers.