  In this paper we show a new way to generate entanglement via two identical
three-level atoms splitting in the magnetic field interacting with the cavity
field. By the system we investigate, We can acquire the EPR state,
multi-dimensional entangled states etc. which are more stable than usual
realization by high-energy-level Rydberg atoms and we can realize the local
exchange operator too. We also achieve the goal of maintaining long- time
entanglement between atoms. At last, by using the procedure of local exchange,
we put forward an experimental scheme for quantum feedback.
