AI 中文总结
研究在空芯光纤中实现高速连续变量量子密钥分发与太比特每秒相干经典传输共存的问题，核心方法是结合超低损耗反谐振空芯光纤与残余载波辅助离散调制连续变量QKD，主要贡献是扩展了共享光纤量子安全相干链路运行范围。
AI 中文摘要
量子密钥分发（QKD）可基于量子力学提供安全密钥，但与高容量经典通信共存仍受限于传统实芯光纤中弱量子态的过量噪声预算。在此，我们将超低损耗反谐振空芯光纤与残余载波辅助离散调制连续变量QKD（DM-CV-QKD）相结合，以解决传播引起的共存噪声和低信噪比相位恢复问题。在一条24.3公里、端到端损耗3.3分贝的空芯链路中，一个双偏振15吉波特的DM-CV-QKD信道实现了平均渐近密钥率（SKR）为153.22兆比特每秒，有限尺寸SKR为149.99兆比特每秒，同时39个相干波分复用信道实现了总数据率7.6太比特每秒和净数据率7.2太比特每秒。该系统甚至在高达15分贝毫瓦的高经典发射功率下且无光学带通滤波器时仍能维持正的SKR。针对集体攻击的有限尺寸分析进一步得出了在等效100公里条件下的预计正密钥率。这些结果表明，反谐振空芯光纤与载波辅助相位恢复相结合，可极大扩展共享光纤量子安全相干链路的运行范围，为将高速CV-QKD与高容量光网络集成提供了一种有前景的方法。
英文摘要
Quantum key distribution (QKD) can provide secret keys with security rooted in quantum mechanics, but operation alongside high-capacity classical traffic remains limited by the excess-noise budget of weak quantum states in conventional solid-core fiber. Here, we combine ultralow-loss anti-resonant hollow-core fiber with residual-carrier-assisted discrete-modulation continuous-variable QKD (DM-CV-QKD) to address both propagation-induced coexistence noise and low-SNR phase recovery. Over a 24.3-km hollow-core link with 3.3-dB end-to-end loss, a dual-polarization 15-Gbaud DM-CV-QKD channel achieves an average asymptotic secret-key rate (SKR) of 153.22 Mb/s and a finite-size SKR of 149.99 Mb/s, while 39 coherent wavelength-division-multiplexed channels deliver an aggregate data rate of 7.6 Tb/s and a net data rate of 7.2 Tb/s. The system can even sustain a positive SKR under a high classical launch power of up to 15 dBm, without an optical bandpass filter (BPF). Finite-size analysis against collective attacks further yields a projected positive secret-key rate at a 100-km-equivalent condition. These results show that an anti-resonant hollow-core fiber, combined with carrier-assisted phase recovery, can greatly extend the operating regime of shared-fiber quantum-secured coherent links, pointing to a promising approach for integrating high-rate CV-QKD with high-capacity optical networks.
