Obstacles to the two-line Josephson traveling wave parametric amplifier (JTWPA) designs, aimed at increasing the allowed pump wave energy and, hence, the gain growth through the combination of linear and nonlinear lines as pump and signal lines is discussed. This analysis takes into account both the mutual coupling and the discreteness of the artificial waveguide lines. Significant restrictions arise from the cyclical transfer of the traveling wave's energy from one line to the other one with phase step by π every beat cycle. Moreover, the other restrictions result from the phase mismatch between the pump, signal and idler waves due to both the coupling and the discreteness of the artificial lines.
@article{arxiv.2404.02549,
title = {Obstacles to two-line Josephson traveling wave parametric amplifier},
author = {Victor K. Kornev and Alena N. Nikolaeva and Nikolay V. Kolotinskiy},
journal= {arXiv preprint arXiv:2404.02549},
year = {2025}
}
Comments
8 pages, 9 figures. v3: accepted manuscript (this preprint has been shared in full compliance with the IEEE's Post-Publication Policy, permission from IEEE must be obtained for all other uses, see https://www.ieee.org/publications/rights/index.html)