Multipartite Entanglement Generation Assisted by Inhomogeneous Coupling
  We show that controllable inhomogeneous coupling between two-level systems and a common data bus provides a fast mechanism to produce multipartite entanglement. Our proposal combines resonant interactions and engineering of coupling strengths---between the qubits and the single mode---leading to well defined entangled states. Furthermore, we show that, if the two-level systems interact dispersively with the quantized mode, engineering of coupling strengths allows the controlled access of the symmetric Hilbert space of qubits. 
C. E. L\'opez, F. Lastra, G. Romero, E. Solano and J. C. Retamal
quant-ph