Characterization of a multimode coplanar waveguide parametric amplifier
M. Simoen, C. W. S. Chang, P. Krantz, Jonas Bylander, W. Wustmann, V. Shumeiko, P. Delsing, C. M. Wilson · Journal of Applied Physics · 2015
We characterize a Josephson parametric amplifier based on a flux-tunable quarter-wavelength resonator. The fundamental resonance frequency is ∼1 GHz, but we use higher modes of the resonator for our measurements. An on-chip tuning line allows for magnetic flux pumping of the amplifier. We investigate and compare degenerate parametric amplification, involving a single mode, and nondegenerate parametric amplification, using a pair of modes. We show that we reach quantum-limited noise performance in both cases.