In contrast, the periodic energy exchange between the atom and the light field induces a periodic motion. In the experiment, the scientist could continuously observe this motion in real time. The light quantum is reflected to and fro between two mirrors. The atom approaches from below, forms a bound state with the light and leaves towards the upper left. The system is an ideal tool to explore fundamental problems concerning the interaction between light and matter.
Possible applications are in the field of information processing with individual quanta.
In the new system, the light-matter interaction is so strong, that it should be possible to realise a photon pistol. Here, individual light quanta would be emitted on demand in a well-defined direction. Such a light source would be new and particularly useful for the transmission of single quantum bits in a future network of quantum computers.