Quantum Entanglement of Flux Qubits via a Resonator
  We show that flux qubits can be efficiently entangled by inductive coupling to a tunable resonant circuit, in the scheme reminiscent of atoms' entanglement through the optical cavity mode. It is shown, in particular, that the single-photon excitation of the resonator produces the pure Bell state of qubits with the completely disentangled LC circuit. 
A.Yu. Smirnov and A.M. Zagoskin