标题： 通过金刚石型原子系综实现的高效率电信频率转换 显示英文标题

标题： High-efficiency telecom frequency conversion via a diamond-type atomic ensemble

摘要： 在原子系统中高效的电信波段频率转换（TFC）对于将基于原子的量子节点集成到低损耗光纤量子网络中至关重要。 在这里，我们通过钻石型四波混频（FWM），在冷87Rb原子系综中实现了从795 nm到1367 nm的高效TFC，在光学深度分别为75和110时，使用弱相干探测场分别达到了66%和80%的转换效率。 这些结果超过了之前在原子系统中所有已报道的值，这得益于对内置V型和级联型电磁诱导透明谱的系统性研究，这些研究指导了FWM条件的优化。 尽管这项工作使用的是相干场，但我们的先前理论研究表明，量子态在转换过程中可以以高保真度得以保留，突显了钻石型原子FWM作为长距离量子通信稳健界面的潜力。 显示英文摘要

摘要： Efficient telecom frequency conversion (TFC) in atomic systems is crucial for integrating atom-based quantum nodes into low-loss fiber-optic quantum networks. Here, we demonstrate high-efficiency TFC from 795 nm to 1367 nm in a cold 87Rb ensemble via diamond-type four-wave mixing (FWM), achieving conversion efficiencies of 66% and 80% at optical depths of 75 and 110, respectively, using a weak coherent probe field. These results surpass all previously reported values in atomic systems, enabled by a systematic investigation of the built-in V-type and cascade-type electromagnetically induced transparency spectra that guided the optimization of FWM conditions. Although this work employs coherent fields, our previous theoretical study has shown that quantum states can be preserved with high fidelity during the conversion process, highlighting the promise of diamond-type atomic FWM as a robust interface for long-distance quantum communication.