论文标题
量子网络的杂化光谱仪灵敏度极限
Heterodyne spectrometer sensitivity limit for quantum networking
论文作者
论文摘要
基于光学异质检测的光谱仪由于其相对简单的结构和超高分辨率而具有吸引力。在这里，我们演示了原理单模式光纤维基于光纤维的杂尼光谱仪，该光纤维光谱仪在1550 nm左右具有生态表分辨率和量子限制的灵敏度。此外，我们报告了使用异差检测检测宽带多谱式 - 周期模式光的广义量子限制，该检测对基于杂化检测的光谱仪提供了灵敏度限制。然后，我们将这种敏感性极限与感兴趣的几种光谱仪类型和昏暗的光源进行比较，例如自发参数下调，拉曼散射和自发的四波混合。我们计算的杂尼光谱仪明显低于单光子检测器，并且无法检测到这些昏暗的光源，除了最明亮和最狭窄的示例外。
Optical heterodyne detection-based spectrometers are attractive due to their relatively simple construction and ultra-high resolution. Here we demonstrate a proof-of-principle single-mode optical-fiber-based heterodyne spectrometer which has picometer resolution and quantum-limited sensitivity around 1550 nm. Moreover, we report a generalized quantum limit of detecting broadband multi-spectral-temporal-mode light using heterodyne detection, which provides a sensitivity limit on a heterodyne detection-based optical spectrometer. We then compare this sensitivity limit to several spectrometer types and dim light sources of interest, such as, spontaneous parametric downconversion, Raman scattering, and spontaneous four-wave mixing. We calculate the heterodyne spectrometer is significantly less sensitive than a single-photon detector and unable to detect these dim light sources, except for the brightest and narrowest-bandwidth examples.
