  Exploiting the intrinsic nonlinearity of superconducting Josephson junctions,
we propose a scalable circuit with superconducting qubits (SCQs) which is very
similar to the successful one now being used for trapped ions. The SCQs are
coupled to the "vibrational" mode provided by a superconducting LC circuit or
its equivalent (e.g., a SQUID). Both single-qubit rotations and
qubit-LC-circuit couplings/decouplings can be controlled by the frequencies of
the time-dependent magnetic fluxes. The circuit is scalable since the
qubit-qubit interactions, mediated by the LC circuit, can be selectively
performed, and the information transfer can be realized in a controllable way.
