AI 中文总结
该研究针对2μm波段集成SPDC光子对源，利用绝缘衬底（Al）GaAs波导平台实现高效光子对产生，完成该波长下集成SPDC源的首次直接联合光谱表征，为相关量子应用提供支撑。
AI 中文摘要
集成光子对源是基于芯片的量子计算、通信和计量学的核心组件。尽管这类光源已在传统电信波长下得到验证，但2μm波段的探索相对较少，不过其在自由空间量子通信、新兴光纤网络中的低损耗传输以及与硅光子平台集成方面具有优势。本文中，我们在直型GaAs和AlGaAs绝缘衬底波导中实现了自发参量下转换（SPDC）。该平台具备强二阶非线性和几何可调色散，有利于实现高效的片上光子对产生。对联合光谱强度和预示二阶关联函数的测量显示，在2μm附近存在宽带发射，且具有强光谱反关联。据我们所知，这是该波长范围内集成SPDC源的首次直接联合光谱表征。
英文摘要
Integrated photon-pair sources are a core component of chip-based quantum computing, communication, and metrology. Although such sources have been demonstrated at conventional telecom wavelengths, the 2 $μ$m band remains comparatively less explored, despite offering advantages for free-space quantum communication, low-loss transmission in emerging fiber networks, and integration with silicon photonic platforms. In this paper, we demonstrate spontaneous parametric down-conversion (SPDC) in straight GaAs- and AlGaAs-on-insulator waveguides. This platform offers strong second-order nonlinearity and geometry-tunable dispersion, which are advantageous for efficient on-chip pair generation. Measurements of the joint spectral intensity and heralded second-order correlation function show broadband emission around 2 $μ$m with strong spectral anti-correlations. To our knowledge, this is the first direct joint-spectral characterization of an integrated SPDC source in this wavelength regime.
Comments14 pages, 8 figures, 2 tables
