Detecting correlated errors in twin-field quantum key distribution
Detecting correlated errors in twin-field quantum key distribution
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DOI：
10.1364/josab.475280
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
B. Panchumarthi;A. Stephens;M. Beck
中科院分区：
文献类型：
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作者：
B. Panchumarthi;A. Stephens;M. Beck
我们通过实验证明，我们可以使用一种与自洽层析成像相关的技术检测双场量子密钥分发（TFQKD）系统中的相关误差。我们实现了一个基于光纤- sagnac环路的TFQKD系统，其中Alice和Bob在环路周围沿相反方向传播的弱相干态相位中编码信息。当这些状态退出循环并被第三方查理检测到时，它们就会相互干扰，查理将测量结果报告给爱丽丝和鲍勃。我们发现，当Alice和Bob只相信他们自己的状态，而不相信Charlie的测量时，可以检测到相关的状态准备和测量误差。
We experimentally demonstrate that we can detect correlated errors in a twin-field quantum key distribution (TFQKD) system by using a technique that is related to self-consistent tomography. We implement a TFQKD system based on a fiber-Sagnac loop, in which Alice and Bob encode information in the phase of weak coherent states that propagate in opposite directions around the loop. These states interfere as they exit the loop and are detected by a third party, Charlie, who reports the results of their measurements to Alice and Bob. We find that it is possible for Alice and Bob to detect correlated state-preparation and measurement errors while trusting only their own individual states, and without trusting Charlie's measurements.