Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2016, Tutor: Josep Taron RocaWe have studied a recent experiment reported in [1] which manifests the discrete
nature of the electromagnetic field inside a cavity. There, it is observed the coupling of atoms to
the e.m. field. We have reproduced the calculations leading to the observation of discrete transition
frequencies between two states of the atom. These frequencies are proportional to the square root
of successive integers, which is a direct evidence of field quantization. Also, we have discussed the
validity of the approximations that we have made
