Measurement of the spiral spectrum of entangled two-photon states.
Measurement of the spiral spectrum of entangled two-photon states.
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DOI：
10.1103/physrevlett.104.020505
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发表时间：
2010-01
影响因子：
8.6
通讯作者：
H. Di Lorenzo Pires;H. Florijn;M. V. van Exter
中科院分区：
文献类型：
--
作者：
H. Di Lorenzo Pires;H. Florijn;M. V. van Exter
我们实现了一种干涉测量方法来测量自发参量下转换产生的光子对的轨道角动量谱。与以往受检测系统模态容量限制的实验不同，我们的方法在整个下转换锥上运行，并揭示了生成的OAM的完整分布。在这种几何中，可以研究新的特征。我们表明，相位匹配条件可以用作增强方位角施密特数和平坦光谱轮廓的工具，从而有效地产生高质量的多维纠缠态。
We implement an interferometric method to measure the orbital angular momentum (OAM) spectrum of photon pairs generated by spontaneous parametric down-conversion. In contrast with previous experiments, which were all limited by the modal capacity of the detection system, our method operates on the entire down-conversion cone and reveals the complete distribution of the generated OAM. In this geometry, new features can be studied. We show that the phase-matching conditions can be used as a tool to enhance the azimuthal Schmidt number and to flatten the spectral profile, allowing the efficient production of high-quality multidimensional entangled states.