Entangling two superconducting LC coherent modes via a superconducting   flux qubit
  Based on a pure solid-state device consisting of two superconducting LC circuits coupled to a superconducting flux qubit, we propose in this paper that the maximally entangled coherent states of the two LC modes can be generated for arbitrary coherent states through flux qubit controls. 
Mei-Yu Chen, Matisse W.Y. Tu and Wei-Min Zhang