级联行波约瑟夫森参量放大器的性能优化
Performance optimization of cascaded traveling wave Josephson parametric amplifiers
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中文总结 AI 辅助
本文提出级联短SNAIL-TWPA与长TWPA的架构，在约1 GHz带宽内实现近30 dB增益且噪声接近量子极限，为高增益宽带量子放大提供实用方案。
中文摘要 AI 辅助
基于约瑟夫森超材料的行波参量放大器（TWPAs）提供宽带增益，且附加噪声接近量子极限。虽然长的非线性超材料器件能够提供高增益，但短的阵列在耗散、泵浦耗尽以及可能降低噪声性能的内部驻波方面受到的影响较小。在此，我们展示了一种级联TWPA架构，该架构结合了两种方法的优点：采用一个短的（736个元件）、低耗散的基于超导非线性非对称电感元件（SNAIL）的TWPA作为第一放大级，随后是一个传统的长（1632个元件）TWPA以提供额外增益。由此产生的放大器级联在约1 GHz的可调带宽内实现了近30 dB的总增益，同时保持附加噪声接近量子极限。我们的结果确立了TWPA级联作为一种高增益、宽带、量子放大的实用方法，在量子信息处理、多模纠缠以及微波频率下的量子传感应用中具有前景。
英文摘要
Traveling-wave parametric amplifiers (TWPAs) based on Josephson metamaterials provide broadband gain with near-quantum-limited added noise. Whereas long nonlinear metamaterial devices can deliver high gain, short arrays suffer less from dissipation, pump depletion, and internal standing waves which can degrade noise performance. Here, we demonstrate a cascaded TWPA architecture that combines the advantages of both approaches by employing a short (736-element), low-dissipation Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL)-based TWPA as the first amplification stage, followed by a conventional long (1632-element) TWPA that provides additional gain. The resulting amplifier cascade achieves nearly 30 dB of total gain over a tunable bandwidth of approximately 1 GHz while maintaining added noise close to the quantum limit. Our results establish a cascade of TWPAs as a practical approach for high-gain, broadband, quantum amplification with applications in quantum information processing, multi-mode entanglement, and quantum sensing applications at microwave frequencies.
发表机构
- Aalto University（阿尔托大学）
- VTT Technical Research Centre of Finland Ltd（芬兰技术研究中心有限公司）
机构由 AI 辅助整理，请以论文原文为准。
