  We present a way to realize a 3-qubit quantum controlled-phase gate with
superconducting qubit systems coupled to a cavity. This proposal does not
require adjustment of the qubit level spacings or identical qubit-cavity
coupling constants. Moreover, since only a resonant interaction is applied, the
gate can be performed fast, within $\sim $ 10 nanosecond. This proposal is
quite general, which can be applied to various types of superconducting qubits,
atoms trapped in a cavity, or quantum dots coupled to a resonator.
