High-Dimensional Photonic Orbital-Angular-Momentum Frequency Interface

作者：Xiaodong Qiu, Haoxu Guo, Yuan Ren, Lixiang Chen · 发表于：Physical Review Applied · 年份：2023 · DOI：10.1103/physrevapplied.19.044072 · 被引用次数：12 · 研究领域：Orbital Angular Momentum in Optics、Quantum Information and Cryptography、Quantum optics and atomic interactions

Frequency interface, namely, converting the colors of photons while retaining their other features, is indispensable for numerous applications ranging from up-conversion imaging to the multimode quantum network. However, limited by the nonuniform nonlinear frequency-conversion efficiency, constructing the frequency interface for high-dimensional spatial modes is still challenging. Here, to break this fundamental barrier, we construct a high-dimensional (HD) orbital-angular-momentum (OAM) frequency interface via conducting sum-frequency generation between HD OAM states to be converted and a radial structured pump. Specifically, by replacing the conventional Gaussian pump with an optimized coherent superposition of HD Laguerre-Gaussian radial modes (i.e., its azimuthal number is zero), we experimentally achieve the OAM frequency interface in nine dimensions with a record fidelity up to 90.38 %. Additionally, by increasing the number of radial modes, our scheme can be flexibly extended to higher dimension. Such a high-dimensional frequency interface could find potential applications in the high-capacity free-space optical communication and would also pave the way for constructing high-dimensional quantum networks.