Direct measurement of ultrafast temporal wavefunctions

作     者：Ogawa, Kazuhisa Okazaki, Takumi Kobayashi, Hirokazu Nakanishi, Toshihiro Tomita, Akihisa 

作者机构：Hokkaido Univ Grad Sch Informat Sci & Technol Sapporo Hokkaido 0600814 Japan Kochi Univ Technol Sch Syst Engn Kochi 7828502 Japan Kyoto Univ Dept Elect Sci & Engn Kyoto 6158510 Japan 

出 版 物：《OPTICS EXPRESS》 (Opt. Express)

年 卷 期：2021年第29卷第13期

页      面：19403-19416页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Research Foundation for Opto-Science and Technology Matsuo Foundation for Science Promotion Japan Society for the Promotion of Science [JP19K14606] Grants-in-Aid for Scientific Research [21K04915] Funding Source: KAKEN 

主　　题：Photons Quantum cryptography Quantum information processing Quantum metrology Spectral phase interferometry for direct field reconstruction Ultrafast measurement 

摘      要：The large capacity and robustness of information encoding in the temporal mode of photons is important in quantum information processing, in which characterizing temporal quantum states with high usability and time resolution is essential. We propose and demonstrate a direct measurement method of temporal complex wavefunctions for weak light at a single-photon level with subpicosecond time resolution. Our direct measurement is realized by ultrafast metrology of the interference between the light under test and self-generated monochromatic reference light;no external reference light or complicated post-processing algorithms are required. Hence, this method is versatile and potentially widely applicable for temporal state characterization. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement