We characterize a novel Josephson parametric amplifier based on a flux-tunable quarter-wavelength resonator. The fundamental resonance frequency is ~1GHz, 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, and we show that the added noise can be less than 0.5 added photons in the case of low gain.
@article{arxiv.1409.8160,
title = {Characterization of a multimode coplanar waveguide parametric amplifier},
author = {M. Simoen and C. W. S. Chang and P. Krantz and Jonas Bylander and W. Wustmann and V. Shumeiko and P. Delsing and C. M. Wilson},
journal= {arXiv preprint arXiv:1409.8160},
year = {2015}
}