  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.
