Effect of a second-harmonic current–phase relation on the behavior of a Josephson traveling-wave parametric amplifier
Abstract
We numerically investigate the behavior of a Josephson traveling-wave parametric amplifier assuming a current–phase relation with a second-harmonic contribution. We find that varying the weight of harmonic terms in the Josephson current affects the gain profile. The analysis of gain characteristics, phase-space portraits, Poincaré sections, and Fourier spectra demonstrates that the nonsinusoidal contribution influences the operating mode and stability of the device. In particular, we identify the optimal weighting of harmonic contributions that maximizes amplification, achieving gains up to ∼13 dB in a device without dispersion engineering.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (6)
Claudio Guarcello
Dipartimento di Fisica “E.R. Caianiello,” Università di Salerno 1 , Via Giovanni Paolo II, 132, I-84084 Fisciano (SA),
Carlo Barone
Giovanni Carapella
Dipartimento di Fisica “E.R. Caianiello,” Università di Salerno 1 , Via Giovanni Paolo II, 132, I-84084 Fisciano (SA),
Giovanni Filatrella
Science and Technology Department, University of Sannio 3 , Benevento,
Andrea Giachero
Department of Physics, University of Milano Bicocca 4 , Piazza della Scienza, I-20126 Milano,
Sergio Pagano