Frequency-Tunable Josephson Junction Resonator for Quantum Computing
- Resource Type
- Periodical
- Authors
- Osborn, K. D.; Strong, J. A.; Sirois, A. J.; Simmonds, R. W.
- Source
- IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 17(2):166-168 Jun, 2007
- Subject
- Fields, Waves and Electromagnetics
Engineered Materials, Dielectrics and Plasmas
Quantum computing
Resonant frequency
Josephson junctions
Voltage
Inductance
Capacitors
Q factor
Circuits
Power transmission lines
Transmission line theory
- Language
- ISSN
- 1051-8223
1558-2515
2378-7074
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.