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单发射器量子密钥分布在175公里的光纤上,具有优化的有限密钥速率

Christopher L Morrison¹, Roberto G Pousa², Francesco Graffitti¹

¹Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.

Nature communications

|June 16, 2023

概括

我们展示了一种使用量子点的量子密钥分布 (QKD) 系统,在长光纤距离上实现高密钥速率. 我们的改进分析大大减少了生成安全量子密钥所需的时间.

科学领域:

量子信息科学量子信息科学
量子通信是一种量子通信.
固态物理固态物理

背景情况:

固态单光子发射器对于量子网络至关重要.
量子密钥分配 (QKD) 的性能正在迅速提高.
与现有电信基础设施的兼容性是一个关键挑战.

研究的目的:

模拟使用量子点生成单个光子的QKD方案.
调查有限密钥分析对安全密钥获取的影响.
为了展示实际的远距离量子网络能力.

主要方法:

量子点单个光子的频率转换为1550nm电信波长.
使用这些光子模拟QKD协议.
在有限键分析中应用乘法切诺夫极限.

主要成果:

实现了高保真度的1.6MHz的计数速率.
在175公里的电信光纤上演示了非对称的正键率.
通过使用更紧密的有限键界限,将所需的信号减少了10^8的倍数,从而实现更快的键生成.

结论:

在QKD中有限密钥分析可以显著高估安全密钥获取时间.
更严格的边界使得实际的密钥生成率接近于非对称极限.
这项工作是朝着使用单发射源的远距离量子网络迈出的重要一步.

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