论文标题
现实世界双场量子键分布的相干相传
Coherent phase transfer for real-world twin-field quantum key distribution
论文作者
论文摘要
量子力学允许通过光方式分布本质上安全的加密密钥。双场量子键分布是其在长距离纤维上实现的最有前途的技术，但需要稳定当事方之间的通信渠道的光学长度。在基于载纤维的原则实验中，这是通过将量子通信与定期调整帧相结合而实现的。在这种方法中，钥匙流的较长责任周期是以宽松的通道长度控制为代价的，而在现实世界中，成功使用此技术的键转移仍然是一个重大挑战。使用源自频率计量学的干涉仪技术，我们开发了一种用于同时键流和通道长度控制的解决方案，并在206 km的野外纤维上证明了它，并具有65 dB损失。我们的技术将通道长度变化贡献的量子位率降低到<1％，代表了现实世界中量子通信的有效解决方案。
Quantum mechanics allows the distribution of intrinsically secure encryption keys by optical means. Twin-field quantum key distribution is the most promising technique for its implementation on long-distance fibers, but requires stabilizing the optical length of the communication channels between parties. In proof-of-principle experiments based on spooled fibers, this was achieved by interleaving the quantum communication with periodical adjustment frames. In this approach, longer duty cycles for the key streaming come at the cost of a looser control of channel length, and a successful key-transfer using this technique in a real world remains a significant challenge. Using interferometry techniques derived from frequency metrology, we developed a solution for the simultaneous key streaming and channel length control, and demonstrate it on a 206 km field-deployed fiber with 65 dB loss. Our technique reduces the quantum-bit-error-rate contributed by channel length variations to <1%, representing an effective solution for real-world quantum communications.
