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

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-04-23 DOI:10.1063/5.0262555

Claudio Guarcello, Carlo Barone, Giovanni Carapella, Giovanni Filatrella, Andrea Giachero, Sergio Pagano

引用次数: 0

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.

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二次谐波电流-相位关系对约瑟夫森行波参量放大器性能的影响

我们数值研究了约瑟夫森行波参数放大器的特性，假设电流相位关系与二次谐波贡献。我们发现改变约瑟夫森电流中谐波项的权重会影响增益分布。增益特性、相空间图、庞加莱剖面和傅立叶谱分析表明，非正弦贡献影响器件的工作模式和稳定性。特别是，我们确定了谐波贡献的最佳加权，使放大最大化，在没有色散工程的器件中实现高达~ 13 dB的增益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.