Frequency-Tunable Josephson Junction Resonator for Quantum Computing

Abstract

We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10 %. Weak coupling to the environment allows a quality factor of $\sim$7000 when on average less than one photon is stored in the resonator. At large photon numbers, the nonlinearity of the Josephson junction creates two stable oscillation states. This resonator can be used as a tool for investigating the quality of Josephson junctions in qubits below the single photon limit, and can be used as a microwave qubit readout at high photon numbers.

3 pages, 5 figures

References in corpus (3)

• Decoherence in Josephson Qubits from Dielectric Loss
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Dispersive measurements of superconducting qubit coherence with a fast, latching readout

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