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| 研究生： |
陳姿安 Chen, Tzu-An |
|---|---|
| 論文名稱： |
週期性極化鈮酸鋰波導中糾纏光子之產生及量測 Generation and measurement of entangled photons from PPLN waveguide |
| 指導教授： |
褚志崧
Chuu, Chih-Sung |
| 口試委員: |
陳彥宏
Chen, Yen-Hung 李瑞光 Lee, Ray-Kuang |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 物理學系 Department of Physics |
| 論文出版年： | 2019 |
| 畢業學年度： | 107 |
| 語文別： | 中文 |
| 論文頁數： | 62 |
| 中文關鍵詞： | 鈮酸鋰波導 、糾纏光子 、自發性降頻轉換 、週期性 、洪德曼干涉 |
| 外文關鍵詞： | PPLN waveguide, entangled photons, Spontaneous Parametric Down-Conversion, polling, Hong-Ou-Mandel interference |
| 相關次數： | 點閱：2 下載：0 |
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自發性降頻轉換 ( Spontaneous Parametric Down-Conversion, SPDC ) 是一個製備單光子以及糾纏態光子的理想來源。短波包在量子資訊和量子傳輸上具有優勢，如何調控波包的寬度成為重要的一環也被廣為研究。在本實驗中我們巧妙的運用損耗來縮短波包在時域上的寬度，生產效率高的波導可以補償損耗的影響。
本實驗和國立中央大學陳彥宏老師實驗室合作，使用週期極化的鈮酸鋰鈦擴散波導( Ti-diffused PPLN waveguide )。我們會在上面鍍上金屬，不同偏振的光子在波導中會有不同的損耗程度，藉由控制損耗的程度來縮短我們的波包，在此模擬因為損耗後波形縮短的情況。實驗上也成功地使用SPDC的機制在鈦擴散波導中產生糾纏光子(entangled photons)，且設計了一套系統來分析我們的光子，隨著量測上需求的不同，改變光路架設，最後使用雙光子干涉Hong-Ou-Mandel的方式，解析尚未加上損耗的波包在時域上的寬度。
Spontaneous parametric down-conversion (SPDC) is an ideal source in quantum technology for generating entangled photon pairs. With short temporal lengths, the entangled photons have potential applications on quantum information and quantum communication. Here, we demonstrate the entangled photons from waveguide-based SPDC with the possibility to realize ultra-short photons.
In our experiment, the photon pairs are generated in Ti-diffused PPLN waveguide. This waveguide is fabricated by our collaborator, Prof. Yen-Hung Chen of National Central University. The loss rates of these waveguides may be varied by the thickness between the layers of PPLN and the gold or aluminum film deposited on the waveguide. Finally, we verify the generation of the entangled photons by detecting them with the Hong-Ou-Mandel interference.
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