arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.04394quant-ph
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基于M-SPGD算法的单模光纤耦合远程量子通信

Single-mode fiber coupling with a M-SPGD algorithm for long-range quantum communications

Kui-Xing Yang, Maimaiti Abulizi, Yu-Huai Li, Bo-Yang Zhang, Shuang-Lin Li, Wei-Yue Liu, Juan Yin, Yuan Cao, Ji-Gang Ren, Cheng-Zhi Peng

摘要:

基于卫星的量子通信是实现全球规模量子网络的一种有前途的方法。对于自由空间量子信道,单模光纤耦合对于提高日光量子密钥分发(QKD)的信噪比以及与标准光纤QKD的兼容性尤为重要。然而,在强大气湍流下实现高效且稳定的单模耦合效率在实验上仍然具有挑战性。在这里,我们开发了一个单模接收机与自适应光学(AO)系统的基础上的随机并行梯度下降(M-SPGD)算法的模态版本,并测试其性能超过8公里的城市地面自由空间信道。在强大气湍流下,M-SPGD自适应光学系统的单模光纤耦合效率提高了3.7dB左右,波动得到了显著抑制,可以应用于自由空间远程量子通信。

英文摘要:

Satellite-based quantum communication is a promising approach for realizing global-scale quantum networks. For free-space quantum channel, single-mode fiber coupling is particularly important for improving signal-to-noise ratio of daylight quantum key distribution (QKD) and compatibility with standard fiber-based QKD. However, achieving a highly efficient and stable single-mode coupling efficiency under strong atmospheric turbulence remains experimentally challenging. Here, we develop a single-mode receiver with an adaptive optics (AO) system based on a modal version of the stochastic parallel gradient descent (M-SPGD) algorithm and test its performance over an 8 km urban terrestrial free-space channel. Under strong atmospheric turbulence, the M-SPGD AO system obtains an improvement of about 3.7 dB in the single-mode fiber coupling efficiency and a significant suppression of fluctuation, which can find its applications in free-space long-range quantum communications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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