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Effect of a second-harmonic current–phase relation on the behavior of a Josephson traveling-wave parametric amplifier

Year: 2025
Type: article
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.
DOI: 10.1063/5.0262555
Authors: Claudio Guarcello, Carlo Barone, Giovanni Carapella, Giovanni Filatrella, Andrea Giachero, Sergio Pagano
Institutions: University of Salerno, Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Salerno, University of Sannio, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca, University of Milano-Bicocca
Language: English
Open Access status: green
Funders: European Commission, Università degli Studi di Salerno, Istituto Nazionale di Fisica Nucleare, Ministero dell'Università e della Ricerca, Horizon 2020 Framework Programme, Nuclear Physics
Awards: G1614537436, G3345895242, Detector Array Readout with Traveling Wave AmplifieRS, G4937468798, G5443090575, G5492296488, G628481380, G6369469362, G6680652046, G777498305, G779502787, G8512683158, G972786147
OpenAlex ID: W4409698663
FWCI: 1.808
Cites: 87
Cited by: 4
Related to: 10