通过高安全密钥率在2公里自由空间信道上进行量子密钥分发
Quantum key distribution over a 2 km free-space channel with a high secure key rate
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中文总结 AI 辅助
研究在2公里自由空间信道上进行量子密钥分发，采用基于快速转向镜和位置敏感探测器配置的有源光束漂移校正，实现了约3.3%量子误码率下164.8kbps的安全密钥率，为现实湍流环境部署高速率长距离自由空间量子通信提供框架。
中文摘要 AI 辅助
自由空间量子密钥分发（QKD）为保障下一代通信网络提供了关键优势，包括移动性和部署灵活性。然而，实际的自由空间实现面临诸多重大挑战，如多光子漏洞、空间模式失配和大气湍流引起的光束波动。在这项工作中，我们通过实验展示了一个自由空间诱骗态BB84 QKD系统，该系统在2公里室外信道上以100MHz重复率和2.5ns脉冲宽度运行。通过采用基于快速转向镜（FSM）和位置敏感探测器（PSD）配置的有源光束漂移校正，我们的系统在约3.3%的量子误码率（QBER）下实现了164.8kbps的安全密钥率。该演示为在现实湍流环境中部署高速率、长距离自由空间量子通信提供了一个实用框架。
英文摘要
Free-space quantum key distribution (QKD) provides crucial advantages, including mobility and deployment flexibility, for securing next-generation communication networks. However, practical free-space implementations face major challenges, such as muilti-photon vulnerabilities, spatial mode mismatch, and atmospheric turbulence-induced beam fluctuations. In this work, we experimentally demonstrate a free-space decoy-state BB84 QKD system operating at a 100 MHz repetition rate with a 2.5 ns pulse width over a 2 km outdoor channel. By employing an active beam-wander correction based on fast-steering mirrors (FSMs) and position sensitive detectors (PSDs) con?figuration, our system achieves a secure key rate of 164.8 kbps under a quantum bit error rate (QBER) of approximately 3.3 %. This demonstration provides a practical framework for deploying high-rate, long-distance free-space quantum communication in realistic turbulence environments.
