Generation and concentration of multi-atom entangled states
Jia Min Tan, Xin-Wen Wang, Mao-Fa Fang · Journal of Physics B Atomic Molecular and Optical Physics · 2006
A direct entanglement concentration protocol for generalized GHZ states is proposed using entanglement swapping in cavity QED. Via this scheme, multi-atom maximally entangled states can be prepared free from the effects of the cavity decay and the thermal field, due to the fact that the interaction here is a large-detuned one between atoms and the cavity.