Journal name not available for this finding
In the history of quantum optics most interference experiments have been performed with neutral particles or pointlike electrons. The advantage of neutral atoms and molecules is the possibility to manipulate their inner structure, e.g. with lasers or by thermic excitation. The benefit of electrons is their easy manipulation and detection. Both characteristics can be combined by performing interferometry experiments with ions and charged molecules. We present new developments and potential applications for the first ion interferometer realized by Hasselbach et al. . Helium or hydrogen ions are thereby field emitted from a novel single atom tip. They are separated and combined by an electrostatic biprism. We propose quantum optical experiments with such a setup in connection with the ion structure dependency in the magnetic and the first direct proof of the electrostatic Aharonov-Bohm effect.