Fock state Rabi oscillations; A building block for the observation of new phenomena in quantum optics

In recent experiments it was demonstrated that number or Fock states of the one-atom maser can be generated. Two types of experiments have been perfor med. In the first one the Fock states are achieved in steady state via the so-called trapping states of the micromaser field. In the second experiment the number states were generated in a dynamical experiment by state reduct ion. In the latter case the generated field was afterwards probed by observ ing the dynamics of a probe atom in the field. The fact that Fock states of the micromaser field can be realised leads to new applications of the micr omaser one of them is the generation of a many particle entanglement of the GHZ type.