Possible realization of entanglement, logical gates and quantum   information transfer with superconducting-quantum-interference-device qubits   in cavity QED
  We present a scheme to achieve maximally entangled states, controlled phase-shift gate, and SWAP gate for two superconducting-quantum-interference-device (SQUID) qubits, by placing SQUIDs in a microwave cavity. We also show how to transfer quantum information from one SQUID qubit to another. In this scheme, no transfer of quantum information between the SQUIDs and the cavity is required, the cavity field is only virtually excited and thus the requirement on the quality factor of the cavity is greatly relaxed. 
Chui-Ping Yang, Shih-I Chu and Siyuan Han
quant-ph