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Frequency-Tunable Josephson Junction Resonator for Quantum Computing



Kevin Osborn, Joshua Strong, Adam J. Sirois, Raymond W. Simmonds


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 7000 in the nonlinear resonator when less than one photon on average 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 the Josephson junctions below the single photon limit, and can be used as a microwave qubit readout at higher energies.
IEEE Transactions on Applied Superconductivity


Quantum Computing


Osborn, K. , Strong, J. , Sirois, A. and Simmonds, R. (2007), Frequency-Tunable Josephson Junction Resonator for Quantum Computing, IEEE Transactions on Applied Superconductivity, [online], (Accessed July 15, 2024)


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Created June 23, 2007, Updated January 27, 2020