by a superconducting stripline cavity with a tunable resonance frequency. The frequency
control is provided by a flux-biased dc superconducting quantum interference device
attached to the cavity. Selective entanglement of the qubit states is achieved by sweeping
the cavity frequency through the qubit-cavity resonances. The circuit is able to accommodate
several qubits and allows one to keep the qubits at their optimal points with respect to …