Nonlinear microwave response of aluminum weak-link Josephson oscillators
Abstract
We present the driven response at T=30 mK of 6 GHz superconducting resonators constructed from capacitively-shunted three-dimensional (3D) aluminum nanobridge superconducting quantum interference devices (nanoSQUIDs). We observe flux modulation of the resonant frequency in quantitative agreement with numerical calculation and characteristic of near-ideal short weak-link junctions. Under strong microwave excitation, we observe stable bifurcation in devices with coupled quality factor (Q) ranging from 30–3500. Near this bias point, parametric amplification with >20 dB gain, 40 MHz bandwidth, and near quantum-limited noise performance is observed. Our results indicate that 3D nanobridge junctions are attractive circuit elements to realize quantum bits.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 21, 2011
- Source ID
- 10.1063/1.3570693
Entities
People
- E. M. Levenson-falk
- I. Siddiqi
- R. Vijay
Organizations
- Air Force Office of Scientific Research
- Defense Advanced Research Projects Agency
- University of California, Berkeley