标题： 独立光频梳驱动的双场量子密钥分发546公里现场测试 显示英文标题

标题： Independent Optical Frequency Combs Powered 546 km Field Test of Twin-Field Quantum Key Distribution

摘要： 由于其类似中继器的速率-损耗缩放特性，双场量子密钥分发（TF-QKD）在实验室中多次展示了其在超长光纤长度安全通信中的优势。然而，现场试验提出了新的挑战，这些挑战必须在技术投入实际应用之前得到解决。在这里，我们验证了在相距直线距离300~km的站点安装独立光学频率梳来实现多功能TF-QKD设置的可行性，该设置无需光学频率传播，从而实现了开放且网络友好的光纤配置。在546和603 km对称链路上，我们记录到有限尺寸的安全密钥率（SKR）分别为0.53~bit/s和0.12 bit/s。具有实际意义的是，该设置被证明能够在452 km链路中支持44~km光纤不对称性。我们的工作标志着将长距离光纤链路纳入大型量子网络的重要一步。 显示英文摘要

摘要： Owing to its repeater-like rate-loss scaling, twin-field quantum key distribution (TF-QKD) has repeatedly exhibited in laboratory its superiority for secure communication over record fiber lengths. Field trials pose a new set of challenges however, which must be addressed before the technology's roll-out into real-world. Here, we verify in field the viability of using independent optical frequency combs -- installed at sites separated by a straight-line distance of 300~km -- to achieve a versatile TF-QKD setup that has no need for optical frequency dissemination and thus enables an open and network-friendly fiber configuration. Over 546 and 603 km symmetric links, we record a finite-size secure key rate (SKR) of 0.53~bit/s and an asymptotic SKR of 0.12 bit/s, respectively. Of practical importance, the setup is demonstrated to support 44~km fiber asymmetry in the 452 km link. Our work marks an important step towards incorporation of long-haul fiber links into large quantum networks.