论文标题
量子钥匙分布中状态准备不确定性的表征
Characterisation of state-preparation uncertainty in quantum key distribution
论文作者
论文摘要
为了实现安全的量子密钥分布，必须将源单元中的所有缺陷都纳入安全证明并在实验室中进行测量。在这里，我们对实验技术进行了原则证明，以表征商业量子键分布系统中的源相和强度波动。当我们将测量的相位波动间隔应用于考虑到状态准备中波动的安全性证明时，它预测了超过100 km的光纤的关键分布距离。但是，测得的强度波动间隔太大，以至于证明预测零键，表明可能需要改进来源。我们的表征方法为未来认证标准铺平了道路。
To achieve secure quantum key distribution, all imperfections in the source unit must be incorporated in a security proof and measured in the lab. Here we perform a proof-of-principle demonstration of the experimental techniques for characterising the source phase and intensity fluctuation in commercial quantum key distribution systems. When we apply the measured phase fluctuation intervals to the security proof that takes into account fluctuations in the state preparation, it predicts a key distribution distance of over 100 km of fiber. The measured intensity fluctuation intervals are however so large that the proof predicts zero key, indicating a source improvement may be needed. Our characterisation methods pave the way for a future certification standard.
