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We present a scheme to achieve maximally entangled states, controlledphase-shift gate, and SWAP gate for twosuperconducting-quantum-interference-device (SQUID) qubits, by placing SQUIDsin a microwave cavity. We also show how to transfer quantum information fromone SQUID qubit to another. In this scheme, no transfer of quantum informationbetween the SQUIDs and the cavity is required, the cavity field is onlyvirtually excited and thus the requirement on the quality factor of the cavityis greatly relaxed.

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Possible realization of entanglement, logical gates and quantum  information transfer with superconducting-quantum-interference-device qubits  in cavity QED