Single-emitter quantum key distribution over 175 km of fibre with optimised finite key rates.
Single-emitter quantum key distribution over 175 km of fibre with optimised finite key rates.
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DOI：
10.1038/s41467-023-39219-5
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发表时间：
2023-06-16
影响因子：
16.6
通讯作者：
Fedrizzi, Alessandro
中科院分区：
文献类型：
--
作者：
Morrison, Christopher L.;Pousa, Roberto G.;Graffitti, Francesco;Koong, Zhe Xian;Barrow, Peter;Stoltz, Nick G.;Bouwmeester, Dirk;Jeffers, John;Oi, Daniel K. L.;Gerardot, Brian D.;Fedrizzi, Alessandro
固态单光子发射器的量子密钥分配由于其快速提高的性能以及与未来量子网络的兼容性而受到关注。在这里，我们模拟量子密钥分配方案，将量子点生成的单光子频率转换为 1550 nm，在 175 km 的电信光纤上实现 1.6 MHz 的计数率和渐近正密钥率。我们表明，由于统计波动的界限过于宽松，非诱饵状态 QKD 常用的有限密钥分析大大高估了安全密钥获取时间。使用更严格的乘法切尔诺夫约束来约束估计的有限密钥参数，我们将所需的接收信号数量减少了 108 倍。在 1 小时的采集时间内，在所有可实现的距离上，所得的有限密钥速率接近渐近极限，并且在 100 公里处，我们以 13 kbps 的速率生成一分钟采集的有限密钥。这一结果是迈向长距离单发射量子网络的重要一步。未来基于单光子的量子网络将需要可靠的电信单光子源和安全分析的改进。在这里，作者展示了如何使用量子点和差频生成来执行远距离 QKD，并通过改进的分析范围减少安全密钥获取时间。
Quantum key distribution with solid-state single-photon emitters is gaining traction due to their rapidly improving performance and compatibility with future quantum networks. Here we emulate a quantum key distribution scheme with quantum-dot-generated single photons frequency-converted to 1550 nm, achieving count rates of 1.6 MHz with and asymptotic positive key rates over 175 km of telecom fibre. We show that the commonly used finite-key analysis for non-decoy state QKD drastically overestimates secure key acquisition times due to overly loose bounds on statistical fluctuations. Using the tighter multiplicative Chernoff bound to constrain the estimated finite key parameters, we reduce the required number of received signals by a factor 108. The resulting finite key rate approaches the asymptotic limit at all achievable distances in acquisition times of one hour, and at 100 km we generate finite keys at 13 kbps for one minute of acquisition. This result is an important step towards long-distance single-emitter quantum networking. Future single-photon-based quantum networks will require both reliable telecom single-photon sources and improvements in security analysis. Here, the authors show how to use quantum dots and difference frequency generation to perform long-distance QKD, also reducing secure key acquisition time thanks to improved analytical bounds.
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影响因子：
4.4
作者：
Da Lio, Beatrice;Faurby, Carlos;Midolo, Leonardo
通讯作者：
Midolo, Leonardo
DOI：
10.1017/s0269964800142032
发表时间：
2000-01-01
影响因子：
1.1
作者：
Klar, B
通讯作者：
Klar, B
影响因子：
4
作者：
Schweickert, Lucas;Jons, Klaus D.;Zwiller, Val
通讯作者：
Zwiller, Val
影响因子：
2.5
作者：
Tomamichel, Marco;Schaffner, Christian;Renner, Renato
通讯作者：
Renner, Renato
影响因子：
3.3
作者：
Brougham, Thomas;Oi, Daniel K. L.
通讯作者：
Oi, Daniel K. L.