Figure 5

Schema of the possible trajectories of the atom emitting photons at times \(t_{i}\), \(\{i,1,5\}\) in the universe of the observer. The vertical blue line with an arrow is the trajectory seen by the observer, where the atom makes Rabi oscillations between \(t_{i}\) and \(t_{i+1}\). The solid red lines stemming from each \(t_{i}\), illustrate the successive splitting of the observer trajectory (universe) in two parts. On a red trajectory (virtual for the observer) no photon is emitted at \(t_{i}\), but Rabi oscillations persist, until a photon is emitted in this universe. This occurs at the crossing points of red curves with purple dot-dashed curves. At these crossing points the “virtual red trajectory” splits into two parts, one (red) with an emitted photon and another one (purple) with no photon emitted