Selective coupling of superconducting qubits via tunable stripline cavity

Abstract

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.

References in corpus (5)

• Spectroscopy on two coupled flux qubits
• Parametric coupling for superconducting qubits
• Tunable coupling scheme for flux qubits at the optimal point
• Fast quantum limited read-out of a superconducting qubit using a slow oscillator
• Readout methods and devices for Josephson-junction-based solid-state qubits

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