Controlled insertion and retrieval of atoms coupled to a high-finesse   optical resonator
  We experimentally investigate the interaction between one and two atoms and the field of a high-finesse optical resonator. Laser-cooled caesium atoms are transported into the cavity using an optical dipole trap. We monitor the interaction dynamics of a single atom strongly coupled to the resonator mode for several hundred milliseconds by observing the cavity transmission. Moreover, we investigate the position-dependent coupling of one and two atoms by shuttling them through the cavity mode. We demonstrate an alternative method, which suppresses heating effects, to analyze the atom-field interaction by retrieving the atom from the cavity and by measuring its final state. 
Mkrtych Khudaverdyan, Wolfgang Alt, Igor Dotsenko, Tobias Kampschulte,   Karim Lenhard, Arno Rauschenbeutel, Sebastian Reick...