約瑟夫森參數放大器之量測流程整合與特性分析

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/99301

Title:	約瑟夫森參數放大器之量測流程整合與特性分析
Authors:	邱羽君;Chiu, Yu-Jiun
Contributors:	物理學系
Keywords:	Josephson 參數放大器;LabVIEW;Python 擬合;集總元件式結構
Date:	2025-11-27
Issue Date:	2026-03-06 18:34:46 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究提出並實現了一種集總元件式參數放大器（Lumped-Element Josephson, LJPA），並建立完整的自動化量測與資料分析流程以驗證其性能。結合 LabVIEW 與 Python 平台，系統可自動掃描磁通偏壓與幫浦功率，同步分析反射參數 $S_{21}$ 並擬合共振頻率對磁通的變化，以萃取零磁通電流 ($I_{\text{zero,flux}}$) 與磁通電流週期性（$I_{periodicity}$）等參數。量測結果顯示，本研究所製作之 LJPA 於幫浦頻率 11.2–11.9 GHz、磁通偏壓 0.33–0.45 $\Phi_0$ 範圍內表現最佳，增益可達 25 dB，頻寬約 100–200 MHz，具穩定且可重現之放大特性。進一步透過條件分析模組（$\text{Gain} > 18~\text{dB}$、$\text{BW} > 0.03~\text{GHz}$ ），能自動辨識可操作區域並執行細部掃描，以鎖定最佳操作點。本研究成功建立 LJPA 操作參數搜尋量測與分析流程，不僅提升操作效率與資料準確性，也驗證集總式設計在高增益與寬頻放大應用上的潛力。;This study presents the design and characterization of a lumped-element Josephson Parametric Amplifier (LJPA) and establishes a fully automated measurement and analysis framework. By integrating LabVIEW and Python, the system automatically scans flux bias and pump power, analyzes reflection data ($S_{21}$), and extracts key parameters such as the zero-flux current ($I_{\text{zero,flux}}$) and flux current periodicity. Experimental results show that the LJPA exhibits optimal performance at pump frequencies of 11.2–11.9 GHz and flux bias between 0.33–0.45 $\Phi_0$, achieving up to 25 dB gain and 100–200 MHz bandwidth with stable and reproducible behavior. A conditional analysis module ($\text{Gain} > 18~\text{dB}$, $\text{Bandwidth} > 0.03~\text{GHz}$ ) further identifies the optimal operation region for precise tuning. This study successfully established a complete measurement and analysis workflow for searching the operating parameters of LJPA, which not only improves operational efficiency and data accuracy but also verifies the potential of the lumped-element design for achieving high gain and wideband amplification applications.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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