  We propose an experimentally realizable method to control the coupling
between two flux qubits. In our proposal, the bias fluxes are always fixed for
these two inductively-coupled qubits. The detuning of these two qubits can be
initially chosen to be sufficiently large, so that their initial interbit
coupling is almost negligible. When a time-dependent magnetic flux (TDMF) is
applied to one of the qubits, a well-chosen frequency of the TDMF can be used
to compensate the initial detuning and to couple two qubits. This proposed
method avoids fast changes of either qubit frequencies or the amplitudes of the
bias magnetic fluxes through the qubit loops, and also offers a remarkable way
to implement any logic gate as well as tomographically measure flux qubit
states.
