本研究提出並成功設計了集總式版本的約瑟夫森參量放大器（JPA），並進行了相關量測以驗證其性能。相比傳統的λ/4共振腔版本，所設計Lumped-element JPA顯著擴展了其頻寬，達到約20倍的提升，顯示出其在實際應用中的潛力。透過理論推導，我們確定了JPA設計的參數範圍，並驗證了關於JPA操作的基本表現，提出了新的設計目標與操作頻率範圍(pQ ∼ 5)。透過實際製作出並量測所設計的元件，我們發現本研究所設計的元件在附加噪聲和飽和功率方面仍有優化空間，未來的研究將集中於通過設計排除損失機制並藉由加入SQUID陣列來提升飽和功率。

This research proposes and successfully designs a lumped-element version of the Josephson Parametric Amplifier (JPA) and conducts relevant measurements to verify its performance. Compared to the traditional λ/4 resonator version, the designed lumped-element JPA significantly expands its bandwidth, achieving about a 20-fold increase, demonstrating its potential in practical applications. Through theoretical derivation, we determined the parameter range for JPA design and verified the basic performance of JPA operation, proposing new design goals and operational frequency range (pQe ∼ 5). Through the actual fabrication and measurement of the designed component, we found that the component designed in this research still has room for optimization in terms of added noise and saturation power. Future research will focus on eliminating loss mechanisms through design and enhancing saturation power by incorporating SQUID arrays.

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