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arXiv 2209.03394quant-ph
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基于优化有限密钥率的单发射器量子密钥分发，跨越175公里光纤

Single-emitter quantum key distribution over 175 km of fiber with optimised finite key rates

Christopher L. Morrison, Roberto G. Pousa, Francesco Graffitti, Zhe Xian Koong, Peter Barrow, Nick G. Stoltz, Dirk Bouwmeester, John Jeffers, Daniel K. L. Oi, B… 展开作者

Christopher L. Morrison, Roberto G. Pousa, Francesco Graffitti, Zhe Xian Koong, Peter Barrow, Nick G. Stoltz, Dirk Bouwmeester, John Jeffers, Daniel K. L. Oi, Brian D. Gerardot, Alessandro Fedrizzi

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9 pages, 3 figures
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AI总结：

利用频率转换至电信波长的量子点单光子发射器，在175 km光纤上实现正密钥率，并通过乘法切尔诺夫界优化有限密钥分析，将所需接收信号数降低10^8倍，在100 km处实现13 kbps有限密钥率。

摘要：

基于固态单光子发射器的量子密钥分发（QKD）因其性能的快速提升以及与未来量子网络架构的兼容性而日益受到关注。在本工作中，我们使用一个频率转换至电信波长的量子点进行了基于光纤的量子密钥分发，实现了1.6 MHz的计数率，且g(2)(0) = 3.6%。我们展示了在渐近机制下最远可达175 km的正密钥率。随后我们指出，针对非诱骗态QKD的社区标准分析方法严重高估了生成安全有限密钥所需的采集时间。我们使用乘法切尔诺夫界改进的分析方法，将所需的接收信号数量相比现有工作减少了10^8倍，在采集时间为一小时的所有可达距离上，有限密钥率均接近渐近极限。在100 km的实际距离上，经过一分钟的积分时间，我们实现了13 kbps的有限密钥率。这一结果标志着向长距离单发射器QKD网络可行性迈出的重大进展。

英文摘要：

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.

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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