Ultracold
87Rbatoms are delivered into a high-finesse optical microcavity using a translating optical lattice trap and detected via the cavity field. The atoms are loaded into an optical lattice from a magneto-optic trap and transported
1.5cm into the cavity. Our cavity satisfies the strong-coupling requirements for a single intracavity atom, thus permitting real-time observation of single atoms transported into the cavity. This transport scheme enables us to vary the number of intracavity atoms from
1to>100 corresponding to a maximum atomic cooperativity parameter of 5400, the highest value ever achieved in an atom-cavity system. When many atoms are loaded into the cavity, optical bistability is directly measured in real-time cavity transmission.
We report an experimental observation of all-optical switching in a cavity QED system consisting of multiple three-level atoms confined in a cavity mode. A signal light is coupled into the normal mode of the cavity-atom system and its transmission through the cavity is switched on or off by a control laser coupled to the atoms from free space. Our experiment shows that the all-optical switching in the cavity QED system can be performed for the cavity mode tuned on resonance with or off resonance from the atomic transition frequency.
An efficient scheme is proposed for the generation of atomic Schrodinger cat states in an optical cavity. Inthe scheme N three-level atoms are loaded in the optical cavity. Raman coupling of two ground states is achieved via alaser field and the cavity mode. The cavity mode is always in the vacuum state and the atoms have no probability ofbeing populated in the excited state. Thus, the scheme is insensitive to both the cavity decay and spontaneous emission. Keywords:atomic Schrodinger cat state, optical cavity, three-level atom