Frequency-Tunable Josephson Junction Resonator for Quantum Computing

Details Frequency-Tunable Josephson Junction Resonator for Quantum Computing Frequency-Tunable Josephson Junction Resonator for Quantum Computing

2007-03-04

arxiv.org/abs/cond-mat/0703103v1

IEEE Transactions on Applied Superconductivity, June 2007, vol.17, no.2, pp. 166-8

Physics

Condensed Matter

Superconductivity

3 pages, 5 figures

Scientific paper

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 $\thicksim$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.

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