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Correction of beam wander for a free-space quantum key distribution system operating in urban environment

机译：在城市环境中运行的自由空间量子密钥分配系统的光束漂移校正

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Free-space quantum key distribution links in an urban environment have demanding operating needs such as functioning in daylight and under atmospheric turbulence, which can dramatically impact their performance. Both effects are usually mitigated with a careful design of the field of view of the receiver. However, a trade-off is often required, since a narrow field of view improves background noise rejection but is linked to an increase in turbulence-related losses. We present a high-speed automatic tracking system to overcome these limitations. Both a reduction in the field of view to decrease the background noise and a mitigation of the losses caused by atmospheric turbulence are addressed. Two different designs are presented and discussed, along with technical considerations for the experimental implementation. Finally, preliminary experimental results of beam wander correction are used to estimate the potential improvement of both the quantum bit error rate and secret key rate of a free-space quantum key distribution system.
机译：城市环境中的自由空间量子密钥分发链接具有苛刻的操作需求，例如在日光下和大气湍流下运行，这可能会极大地影响其性能。仔细设计接收器的视野通常可以减轻这两种影响。但是，通常需要权衡取舍，因为狭窄的视野会改善背景噪声的抑制能力，但会增加与湍流相关的损耗。我们提出了一种高速自动跟踪系统来克服这些限制。既解决了减小背景噪声以减小背景噪声的问题，又减轻了由大气湍流引起的损耗的问题。介绍和讨论了两种不同的设计，以及实验实现的技术考虑。最后，使用束流漂移校正的初步实验结果来估计自由空间量子密钥分配系统的量子误码率和秘密密钥率的潜在改进。

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