本計畫提出以非線性準相位匹配技術及先進絕熱耦合機制來研發新穎的非線性與積體量子 光路元件及技術，本研發將有助於量子光源與量子資訊系統(如量子即時傳輸、量子計算、量 子密碼術等)等方面的研究與應用。本計畫將開發三大核心技術，分別為非週期光學超晶格自 發參量下轉換波導技術來研發雙對糾纏態光子源、寬頻及高絕熱性偏振態分離波導耦合技術 來空間分離所產生之偏振糾纏態光子對及一準相位匹配串級二階非線性全光開關技術。 以這些技術我們將致力於在計畫第一年完成設計製作與驗證一非週期性晶疇極化反轉鈮 酸鋰自發參量下轉換波導光源產生雙對非簡併波長之偏振糾纏態光子及一高寬頻及高絕熱性波 導耦合器於鈮酸鋰晶片上作為產生低噪音偏振糾纏態光子對之元件，在第二年計畫研發完成一 新穎的電光量子態可調控之高積體量子光源元件，並在第三年計畫以準相位匹配串級二階非 線性絕熱耦合器技術研發一高工作頻寬之全光開關器。 雖然非線性與量子科技是相對較新且較基礎的研究，但我相信非線性與量子科技是當前最 具價值也最值得投入研究的領域之一，因為它是建構下一代資訊處理及計算系統最關鍵的技 術。我們期待此計畫的投入與完成能促進相關領域的科學發展與產業競爭力。 ;In this project, I propose the application of nonlinear quasi-phase-matching technology and advanced adiabatic directional coupling mechanism to study and develop novel nonlinear and integrated quantum photonic circuits/devices (IQPD) technology. The IQPD technology has been a rising technology and become an essential and undisputed solution for realizing quantum systems including the next-generation (even the ultimate) information processing and computing (known as the quantum network) systems. Three core technologies are to be developed to realize the proposed nonlinear and quantum devices. They are the spontaneous parametric down-conversion (SPDC) waveguide sources in aperiodic optical superlattice for realizing a polarization-entangled source in a deterministic nondegenerate scheme, a broadband and high-adiabaticity polarization-dependent directional coupling technology for performing the spatial separation of the twin photons of orthogonal polarization, and a quasi-phase-matched (QPM) cascaded quadratic nonlinear switching technology based on an adiabatic directional coupler system. I aim in the first project year to accomplish the development of the design, fabrication, and measurement technology for demonstrating an aperiodically poled lithium niobate waveguide SPDC source capable of the generation of two polarization-entangled, nondegenerate photon pairs, and moreover, a broadband and high-adiabaticity waveguide coupler in LiNbO3 to function as a spatial separator for photon pair sources to achieve low noise polarization entanglement, in the second project year, to accomplish the proof-of-principle demonstration of a novel IQPD working as an electro-optically quantum-state tunable entangled photon-pair source, and finally in the third project year, to accomplish the study of a high working bandwidth all-optical switch based on QPM cascaded quadratic adiabatic couplers. Though nonlinear and quantum science and technology are relatively new and fundamental subjects, the PI believes they are one of the most valuable topics that we should focus on and invest in because they are key technologies for building next-generation information processing and computing systems. The accomplishment of this project is certainly to promote the scientific and industrial competitiveness on research and development of relevant fields.
