arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.05088quant-ph
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与测量设备无关的长距离自由空间量子密钥分发

Long-distance free-space measurement-device-independent quantum key distribution

Yuan Cao, Yu-Huai Li, Kui-Xing Yang, Yang-Fan Jiang, Shuang-Lin Li, Xiao-Long Hu, Maimaiti Abulizi, Cheng-Long Li, Weijun Zhang, Qi-Chao Sun, Wei-Yue Liu, Xiao … 展开作者

Yuan Cao, Yu-Huai Li, Kui-Xing Yang, Yang-Fan Jiang, Shuang-Lin Li, Xiao-Long Hu, Maimaiti Abulizi, Cheng-Long Li, Weijun Zhang, Qi-Chao Sun, Wei-Yue Liu, Xiao Jiang, Sheng-Kai Liao, Ji-Gang Ren, Hao Li, Lixing You, Zhen Wang, Juan Yin, Chao-Yang Lu, Xiang-Bin Wang, Qiang Zhang, Cheng-Zhi Peng, Jian-Wei Pan

摘要:

基于双光子干涉的与测量设备无关的量子密钥分发(MDI-QKD)对所有针对检测系统的攻击都是免疫的,并且允许具有不可信中继的QKD网络。自MDI-QKD协议提出以来,基于光纤的实现已经朝着更长距离、更高密钥速率和网络验证的方向迅速发展。然而,由于大气湍流的影响,在自由空间信道上实现MDI-QKD仍然是一个实验难题。在这里,通过开发强大的自适应光学系统,高精度的时间同步和频率锁定之间的独立光子源位于远离,我们实现了第一个自由空间MDI-QKD超过19.2公里的城市大气信道,这远远超过了有效的大气厚度。我们的实验迈出了基于卫星的MDI-QKD的第一步。此外,这里开发的技术为自由空间中涉及独立单光子长距离干涉的量子实验开辟了道路。

英文摘要:

Measurement-device-independent quantum key distribution (MDI-QKD), based on two-photon interference, is immune to all attacks against the detection system and allows a QKD network with untrusted relays. Since the MDI-QKD protocol was proposed, fibre-based implementations have been rapidly developed towards longer distance, higher key rates, and network verification. However, owing to the effect of atmospheric turbulence, MDI-QKD over free-space channel remains experimentally challenging. Here, by developing the robust adaptive optics system, high precision time synchronization and frequency locking between independent photon sources located far apart, we realised the first free-space MDI-QKD over a 19.2-km urban atmospheric channel, which well exceeds the effective atmospheric thickness. Our experiment takes the first step towards satellite-based MDI-QKD. Moreover, the technology developed here opens the way to quantum experiments in free space involving long-distance interference of independent single photons.

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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