  Here, we propose a scheme to generate a controllable Ising interaction
between superconducting flux qubits. Existing schemes rely on inducting
couplings to realize Ising interactions between flux qubits, and the
interaction strength is controlled by an applied magnetic field On the other
hand, we have found a way to generate an interaction between the flux qubits
via capacitive couplings. This has an advantage in individual addressability,
because we can control the interaction strength by changing an applied voltage
that can be easily localized. This is a crucial step toward the realizing
superconducting flux qubit quantum computation.
