Opt Lett. 2019 Jan 15;44(2):235-238. doi: 10.1364/OL.44.000235.
We experimentally demonstrate the production of photon pairs at 1555 nm in LP mode and at 1566.8 nm in LP mode, respectively, via the spontaneous intermodal four-wave mixing in a 100-m-long few-mode fiber. We achieve a coincidence to accidental-coincidence ratio of 28, which clearly indicates the existence of quantum correlation. We also discuss the contribution of spontaneous Raman scattering to the background noise of photon pairs. Our source of photon pairs, compatible with the low-loss multiplexing and de-multiplexing components for space division multiplexing optical fiber communication, can be used for generating higher-dimensional entanglement.
我们通过在 100 米长的少模光纤中的自发模间四波混频，分别在 LP 模式下产生了 1555nm 的光子对和在 LP 模式下产生了 1566.8nm 的光子对。我们实现了 28 的符合到意外符合的比率，这清楚地表明了量子相关性的存在。我们还讨论了自发拉曼散射对光子对背景噪声的贡献。我们的光子对源与用于空分复用光纤通信的低损耗复用和解复用组件兼容，可用于产生更高维的纠缠。
