标题： 基于双场量子密钥分发的被动偏振和相位稳定方案 显示英文标题

标题： Passive polarization and phase stabilization scheme for Twin-Field QKD

摘要： 双场量子密钥分发需要爱丽丝和鲍勃在中间站查理处发送的相干态之间的一阶干涉。为了获得稳定运行和最大干涉可见度，不仅需要相位稳定，还需要偏振控制，尤其是在光纤设置中。在本文中，我们提出了一种实验装置，通过将类似萨格纳克的干涉仪与采用法拉第镜的“即插即用”配置相结合，同时提供相位和偏振波动的被动稳定。实验结果表明，在72小时连续运行期间，净干涉可见度保持在约95.3%，标准偏差为0.47%。该装置可以简单地适应多用户场景，采用星型网络、总线拓扑结构或两者的组合。 显示英文摘要

摘要： Twin-Field Quantum Key Distribution requires first-order interference between coherent states sent by Alice and Bob in a mid-station Charlie. In order to obtain stable operation and maximum interferometric visibility, not only phase stabilization but also polarization control is required, especially in optical-fiber setups. In this paper, we propose an experimental setup that simultaneously provides passive stabilization of phase and polarization fluctuations by combining a Sagnac-like interferometer with a "Plug-and-Play" configuration employing Faraday mirrors. Experimental results show a net interferometric visibility maintained around 95.3% during 72 hours of continuous operation, with a standard deviation of 0.47%. The setup can be straightforwardly adapted to a multi-user scenario employing either a star network, a bus topology, or a combination of both.