论文标题
超过175 km光纤的单个发射极量子键分布，并具有优化的有限密钥速率
Single-emitter quantum key distribution over 175 km of fiber with optimised finite key rates
论文作者
论文摘要
具有固态单光子发射器的量子键分布由于其迅速提高的性能和与未来量子网络体系结构的兼容性而获得了吸引力。在这项工作中，我们执行基于纤维的量子键分布，并用量子点转换为电信波长，以$ g^{\ left（2 \ right）} \ left（0 \ orirt）= 3.6 \％$实现计数速率为1.6 MHz。在渐近状态下，我们显示出高达175公里的正钥匙率。然后，我们表明，非专业状态QKD的社区标准分析大大高估了生成安全有限密钥所需的获取时间。我们使用多重Chernoff绑定的改进分析将所需的接收信号数量减少了$ 10^8 $的$ 10^8 $，而有限的关键率在所有可实现的距离范围内接近渐近限制，以获取一小时的收购时间。在整合一分钟后，在100公里的实际距离内，我们达到了13 kbps的有限密钥速率。该结果代表了朝着长距离单位QKD网络的可行性方面的重大进展。
Quantum key distribution with solid-state single-photon emitters is gaining traction due to their rapidly improving performance and compatibility with future quantum network architectures. In this work, we perform fibre-based quantum key distribution with a quantum dot frequency-converted to telecom wavelength, achieving count rates of 1.6 MHz with $g^{\left(2\right)}\left(0\right) = 3.6 \%$. We demonstrate positive key rates up to 175 km in the asymptotic regime. We then show that the community standard analysis for non-decoy state QKD drastically overestimates the acquisition time required to generate secure finite keys. Our improved analysis using the multiplicative Chernoff bound reduces the required number of received signals by a factor of $10^8$ over existing work, with the finite key rate approaching the asymptotic limit at all achievable distances for acquisition times of one hour. Over a practical distance of 100 km we achieve a finite key rate of 13 kbps after one minute of integration time. This result represents major progress towards the feasibility of long-distance single-emitter QKD networks.
