论文标题
高保真空间模式通过1公里长的多模纤维通过矢量时间逆转
High-fidelity spatial mode transmission through a 1-km-long multimode fiber via vectorial time reversal
论文作者
论文摘要
标准多模纤维支持的大量空间模式是通过数量级来提高量子和经典通信的通道容量的有前途的平台。然而，长多模纤维的实际使用受到模态串扰和极化混合的严重阻碍。为了克服这些挑战，我们开发和实验证明了一种矢量时间逆转技术，该技术是通过数字化预成型的波前和向前传播信号光束的极化来实现的，它是辅助，后向促进探针梁的相位轭。在这里，我们通过在未稳定的1公里长的纤维上使用矢量时间逆转来报告210 Laguerre-Gauss和Hermite-Gauss模式的平均模态保真度高于80％。我们还建议在长多模纤维上使用实用且可扩展的空间模式量子通信协议，以说明我们技术可以启用的潜在应用。
The large number of spatial modes supported by standard multimode fibers is a promising platform for boosting the channel capacity of quantum and classical communications by orders of magnitude. However, the practical use of long multimode fibers is severely hampered by modal crosstalk and polarization mixing. To overcome these challenges, we develop and experimentally demonstrate a vectorial time reversal technique, which is accomplished by digitally pre-shaping the wavefront and polarization of the forward-propagating signal beam to be the phase conjugate of an auxiliary, backward-propagating probe beam. Here, we report an average modal fidelity above 80% for 210 Laguerre-Gauss and Hermite-Gauss modes by using vectorial time reversal over an unstabilized 1-km-long fiber. We also propose a practical and scalable spatial-mode-multiplexed quantum communication protocol over long multimode fibers to illustrate potential applications that can be enabled by our technique.
