Hamer Anica, Razavi Tabar Seyed Mahdi, Yashwantrao Priyanka, Aghababaei Alireza, Vewinger Frank, Stellmer Simon
Opt Lett. 2024 Feb 1;49(3):506-509. doi: 10.1364/OL.516461.
Large-scale quantum networks rely on optical fiber networks and photons as so-called flying qubits for information transport. While dispersion and absorption of optical fibers are minimum at the infrared telecom wavelengths, most atomic and solid state platforms operate at visible or near-infrared wavelengths. Quantum frequency conversion is required to bridge these two wavelength regimes, and nonlinear crystals are currently employed for this process. Here, we report a novel approach of frequency conversion to the telecom band. This interaction is based on coherent Stokes Raman scattering (CSRS), a four-wave mixing process resonantly enhanced in a dense molecular hydrogen gas. We show the conversion of photons from 863 nm to the telecom O-band and demonstrate that the input polarization state is preserved. This process is intrinsically broadband and can be adapted to any other wavelength.
大规模量子网络依赖光纤网络和光子作为所谓的飞行量子比特来进行信息传输。虽然光纤的色散和吸收在红外电信波长处最小，但大多数原子和固态平台在可见光或近红外波长下运行。需要量子频率转换来连接这两个波长范围，目前该过程采用非线性晶体。在此，我们报告了一种将频率转换到电信频段的新方法。这种相互作用基于相干斯托克斯拉曼散射（CSRS），这是一种在高密度分子氢气中谐振增强的四波混频过程。我们展示了光子从863纳米转换到电信O波段，并证明输入偏振态得以保留。这个过程本质上是宽带的，并且可以适应任何其他波长。
