本研究致力於通訊波段糾纏光子源之建立與表徵，並以遠端態準備作為代表性的量子網路任務，探討其任務導向評估之應用潛力。在理論方面，我們建立考量多光子對發射的雜訊模型，並以光子對發射振幅與二階相關函數量化多對效應，分析其對雙光子干涉對比度與四光子狀態保真度下界預測，此模型可用於描述自發參數下轉換光源在不同操作條件下的多光子雜訊貢獻，並提供評估糾纏資源品質的理論基礎。實驗上以兩組薩格納克結構之第二型自發參數下轉換產生通訊波段偏振糾纏光子對，並透過符合計數率、依據理論模型取得的光子對發射振幅，以及超導奈米線單光子偵測器之偵測效率，表徵光源平台在實際操作條件下的光子對產生特性與偵測效能。此外，本研究引入遠端態準備作為具代表性的量子網路任務，用以建立任務導向的糾纏資源評估觀點。整體而言，本研究結合通訊波段糾纏光子源建置、多光子雜訊分析、探測器效能表徵與任務導向評估觀點，建立一套由理論到實驗的評估架構，為後續可擴展光量子網路實驗與遠端量子資訊任務之研究提供基礎。

This study focuses on the construction and characterization of a telecom-wavelength entangled photon source and investigates its application potential for task-oriented evaluation, using remote state preparation as a representative quantum networking task. On the theoretical side, we develop a noise model that takes multi-photon pair emissions into account. The multi-pair contribution is quantified using the pair-emission amplitude and the second-order correlation function, allowing us to analyze its influence on the two-photon interference visibility and the predicted fidelity lower bound of four-photon states. This model provides a theoretical basis for describing the multi-photon noise contribution of spontaneous parametric down-conversion sources under different operating conditions and for evaluating the quality of entanglement resources. Experimentally, telecom-wavelength polarization-entangled photon pairs are generated using two type-II spontaneous parametric down-conversion sources based on Sagnac interferometer configurations. The photon-pair generation characteristics and detection performance of the source platform under practical operating conditions are characterized through the coincidence count rate, the pair-emission amplitude obtained from the theoretical model, and the detection efficiencies of superconducting nanowire single-photon detectors. In addition, this study introduces remote state preparation as a representative quantum networking task to establish a task-oriented perspective for evaluating entanglement resources. Overall, this work combines the construction of a telecom-wavelength entangled photon source, multi-photon noise analysis, detector-performance characterization, and task-oriented evaluation. It establishes a theoretical-to-experimental evaluation framework and provides a foundation for future studies on scalable photonic quantum network experiments and remote quantum information tasks.

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