Physics – Condensed Matter – Superconductivity
Scientific paper
2006-08-09
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.74.224506
We theoretically investigate selective coupling of superconducting charge qubits mediated by a superconducting stripline cavity with a tunable resonance frequency. The frequency control is provided by a flux biased dc-SQUID 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 scalable, and allows to keep the qubits at their optimal points with respect to decoherence during the whole operation. We derive an effective quantum Hamiltonian for the basic, two-qubit-cavity system, and analyze appropriate circuit parameters. We present a protocol for performing Bell inequality measurements, and discuss a composite pulse sequence generating a universal control-phase gate.
Shumeiko Vitaly S.
Wallquist Margareta
Wendin Goran
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