Phase‐Modulated Interferometry, Spectroscopy, and Refractometry using Entangled Photon Pairs
Phase‐Modulated Interferometry, Spectroscopy, and Refractometry using Entangled Photon Pairs
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DOI：
10.1002/qute.201900114
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发表时间：
2019-10
影响因子：
4.4
通讯作者：
J. Lavoie;Tiemo Landes;Amr Tamimi;Brian J. Smith;A. Marcus;M. Raymer
中科院分区：
文献类型：
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作者：
J. Lavoie;Tiemo Landes;Amr Tamimi;Brian J. Smith;A. Marcus;M. Raymer
将共线自发参数下转换产生的宽带时频纠缠光子对（EPP）注入到单个输入端口后，作者通过测量在马赫-曾德尔干涉仪（MZI）输出端口的单光子计数探测器之间的重合计数，证明了一种双光子计数干涉的形式。通过扫描另一条路径的长度，对插入MZI内部路径的样品进行光谱学和折射学分析，获得样品线性响应的相位和幅度信息。相位调制和锁相检测被引入，以提高检测信噪比，并实现扫描干涉仪延迟的“下采样”技术，从而降低了完全再现时间干涉图所需的采样要求。相位调制技术还允许单独提取导致最终检测结果的各种量子态路径的贡献。费曼图经常用于分子光谱学的背景下，用来描述时间-频率EPPs通过MZI的相干性所产生的干扰。这些结果是实现分子光谱-量子光-增强二维光谱方法的重要一步。
The authors demonstrate a form of two‐photon‐counting interferometry by measuring the coincidence counts between single‐photon‐counting detectors at an output port of a Mach–Zehnder Interferometer (MZI) following injection of broad‐band time‐frequency‐entangled photon pairs (EPP) generated from collinear spontaneous parametric down conversion into a single input port. Spectroscopy and refractometry are performed on a sample inserted in one internal path of the MZI by scanning the other path in length, which acquires phase and amplitude information about the sample's linear response. Phase modulation and lock‐in detection are introduced to increase detection signal‐to‐noise ratio and implement a “down‐sampling” technique for scanning the interferometer delay, which reduces the sampling requirements needed to reproduce fully the temporal interference pattern. The phase‐modulation technique also allows the contributions of various quantum‐state pathways leading to the final detection outcomes to be extracted individually. Feynman diagrams frequently used in the context of molecular spectroscopy are used to describe the interferences resulting from the coherence properties of time‐frequency EPPs passing through the MZI. These results are an important step toward the implementation of a proposed method for molecular spectroscopy—quantum‐light‐enhanced 2D spectroscopy.