标题： 氢气填充的空心光纤中的频率转换：功率扩展、背景和带宽 显示英文标题

标题： Frequency conversion in a hydrogen-filled hollow-core fiber: power scaling, background, and bandwidth

摘要： 基于光纤的大面积量子网络允许近红外波长的光子以最小的损耗传播。 量子频率转换是一种在保持单光子量子态的同时改变其波长的方法。 最常见的是使用非线性晶体进行此转换过程，在高保真度下已实现了接近单位转换效率。 然而，基于晶体的转换过程受到强烈背景噪声、非常有限的光谱带宽以及强泵浦场下的不均匀温度分布的困扰。 在以前的工作中，我们展示了在氢气填充的空心光纤中的频率转换，并声称该转换过程在强泵浦场下不会影响性能，基本上没有背景噪声，并且固有宽带。 在这里，我们证明了这三个声明是合理的。 显示英文摘要

摘要： Large-area quantum networks based on optical fibers allow photons at near-infrared wavelengths to travel with minimal loss. Quantum frequency conversion is a method to alter the wavelength of a single photon while maintaining its quantum state. Most commonly, nonlinear crystals are employed for this conversion process, where near-unity conversion efficiency at high fidelity has been demonstrated. Still, the crystal-based conversion process is plagued by strong background noise, very limited spectral bandwidth, and inhomogeneous temperature profiles at strong pump fields. In previous work, we have demonstrated frequency conversion in hydrogen-filled hollow-core fibers and claimed that this conversion process does not compromise performance at strong pump fields, is essentially free of background noise, and intrinsically broadband. Here, we demonstrate that these three claims are justified.