請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/99043完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃斯衍 | zh_TW |
| dc.contributor.advisor | Ssu-Yen Huang | en |
| dc.contributor.author | 李念宇 | zh_TW |
| dc.contributor.author | Nien-Yu Li | en |
| dc.date.accessioned | 2025-08-21T16:10:03Z | - |
| dc.date.available | 2025-08-22 | - |
| dc.date.copyright | 2025-08-21 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-08-01 | - |
| dc.identifier.citation | P. Krantz, M. Kjaergaard, F. Yan, T. P. Orlando, S. Gustavsson, and W. D. Oliver. A quantum engineer’s guide to superconducting qubits. Applied Physics Reviews, 6(2):021318, 06 2019.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/99043 | - |
| dc.description.abstract | 現行的超導量子位元架構越來越多採用包含可調耦合器的系統，以便在未執行雙量子位元閘操作時，能有效關閉相鄰量子位元間的耦合，從而達到更佳的雙量子位元閘保真度。然而，由於可調耦合器通常不具備獨立的量測線路，使得整體磁通串擾的量測與分析變得困難。
本研究針對由多顆可調式 transmon 量子位元與耦合器所構成之超導量子系統，進行磁通串擾效應的量化分析與補償技術開發。透過 Two-Tone Spectroscopy 與 Ramsey 干涉法建構磁通串擾矩陣，並搭配線性模型進行偏壓映射與補償參數提取，成功將非預期耦合導致的磁通串擾抑制至O(10−4 )。補償後系統具備更佳的頻率可控性，顯著提升元件間的獨立操作能力。此外，我們亦展示補償機制能促進 CZ gate 操作點之辨識。並藉由比較不同封裝方式下的樣品設計，指出控制線接地處理對於抑制近距離磁通串擾具顯著影響。 | zh_TW |
| dc.description.abstract | Modern superconducting quantum processors increasingly adopt architectures incorporating tunable couplers, which allow the effective decoupling of neighboring qubits when two-qubit gates are idle, thereby improving two-qubit gate fidelity. However, since these couplers typically lack independent readout lines, it becomes challenging to characterize the overall flux crosstalk in such systems.
This thesis investigates flux crosstalk in a superconducting quantum processor composed of multiple frequency-tunable transmon qubits and couplers. By constructing crosstalk matrices using the Two-Tone and Ramsey measurement, and applying a linear compensation model, we successfully suppress unintended magnetic coupling to O(10−4 ). The compensated system exhibits improved frequency controllability and enhanced orthogonality of the bias control lines, enabling more independent operation of individual components. Furthermore, we demonstrate that the compensation procedure facilitates the identification of CZ gate operating points. Finally, by comparing different packaging configurations we analyze the impact of wire bonding on flux crosstalk. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-08-21T16:10:03Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-08-21T16:10:03Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 致謝 i
摘要 iii Abstract v 目次 vii 圖次 ix 表次 xi 第一章 緒論 1 第二章 理論模型架構 3 2.1 Transmon 量子位元 3 2.1.1 二能級系統與量子諧振子 3 2.1.2 約瑟夫森接面與非線性能階 5 2.1.3 SQUID 與頻率可調性 8 2.1.4 微波驅動下的量子位元動力學 10 2.1.5 Ramsey 干涉實驗與磁通感測原理 13 2.2 讀取共振腔與Dispersive 讀取機制 16 2.3 可調耦合器與ZZ Interaction 20 2.4 磁通串擾 23 2.4.1 硬體層面解決策略 23 2.4.2 量測層面補償策略 24 第三章實驗設備架構 27 3.1 晶片架構 27 3.2 低溫傳輸架構 30 第四章實驗方法與結果 33 4.1 Two-Tone Spectroscopy 與量子位元頻率掃描 33 4.2 耦合器頻率量測 35 4.3 磁通串擾量測與補償 37 4.3.1 使用Two-Tone Spectroscopy 建立串擾矩陣 37 4.3.2 使用Ramsey 干涉法建立串擾矩陣 40 4.3.3 串擾補償方法 41 4.4 初始化時間與脈衝時間對量子位元頻率及磁通串擾之影響 43 4.4.1 對量子位元頻率之影響 43 4.4.2 Pulse 時長對磁通串擾之影響 44 4.5 實驗結果與數據分析 47 4.5.1 串擾矩陣與補償之效果分析 47 4.5.2 磁通串擾補償對CZ 閘操作點優化之影響 50 4.5.3 wire bonding 對磁通串擾影響之比較 52 第五章結論與討論 55 5.1 結論 55 5.2 討論 56 參考文獻 59 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 可調式耦合器 | zh_TW |
| dc.subject | 超導量子位元 | zh_TW |
| dc.subject | CZ 閘 | zh_TW |
| dc.subject | 磁通串擾 | zh_TW |
| dc.subject | Transmon | en |
| dc.subject | tunable coupler | en |
| dc.subject | CZ gate | en |
| dc.subject | Superconducting qubit | en |
| dc.subject | flux crosstalk | en |
| dc.title | 具可調式耦合器之超導多量子位元系統的磁通串擾特性分析與抑制 | zh_TW |
| dc.title | Characterization and Suppression of Flux Crosstalk in Superconducting Multi-Qubit Systems with Tunable Couplers | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.coadvisor | 柯忠廷 | zh_TW |
| dc.contributor.coadvisor | Chung-Ting Ke | en |
| dc.contributor.oralexamcommittee | 王喬萱;陳啟東 | zh_TW |
| dc.contributor.oralexamcommittee | Chiao-Hsuan Wang;Chii-Dong Chen | en |
| dc.subject.keyword | 超導量子位元,可調式耦合器,磁通串擾,CZ 閘, | zh_TW |
| dc.subject.keyword | Superconducting qubit,Transmon,tunable coupler,flux crosstalk,CZ gate, | en |
| dc.relation.page | 67 | - |
| dc.identifier.doi | 10.6342/NTU202502632 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2025-08-06 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 物理學系 | - |
| dc.date.embargo-lift | 2025-08-22 | - |
| 顯示於系所單位： | 物理學系 | |
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