  We discuss a general physical mechanism for arbitrary control of the quantum
states of multiple qubits in the symmetric Dicke subspace. The qubit-qubit
coupling leads to unequal energy spacing in the symmetric Dicke subspace. This
allows one to manipulate a prechosen transition with an external driving
source, with other transitions remaining off-resonant. Any entangled state in
the symmetric Dicke subspace can be created from the initial ground state by
tuning the driving source. We illustrate the idea in cavity QED, but it should
be applicable to other related systems.
