AI 中文总结
该研究针对广域光纤量子链路的偏振漂移问题，构建联合控制协议动态调整参数，在保真度约束下提升纠缠分发速率，模拟显示其较静态策略提升14%且无需离线优化。
AI 中文摘要
量子网络链路必须以高速率分发纠缠，同时满足应用指定的保真度要求。然而，广域部署的光纤链路存在偏振漂移，会破坏端到端保真度的稳定性，需定期补偿。当前部署方案常采用带固定控制策略的主动稳定技术，性能提升多依赖量子硬件的进步，而软件控制的研究相对不足。本文将量子链路运行建模为可调速率-保真度权衡与不可控链路漂移的联合控制问题，基于该框架构建链路控制协议，动态调整源泵浦功率与偏振补偿，在满足最低保真度约束的前提下最大化纠缠分发速率。我们利用64公里部署光纤的数据进行轨迹驱动模拟评估该协议，结果显示，与优化后的静态策略相比，自适应控制器在24小时轨迹下的平均纠缠分发速率提升14%，且无需任何离线策略优化。研究表明，基于软件的物理层控制可在无需额外量子硬件的情况下，成为提升近期量子链路性能的实用机制。
英文摘要
Quantum network links must distribute entanglement at high rates while satisfying application-specified fidelity demands. However, wide-area deployed fiber links suffer from polarization drift which destabilizes end-to-end fidelity and forces periodic compensation. Current deployments often use active stabilization with fixed control policies, and improvements generally stem from advances in quantum hardware. Meanwhile, software control remains relatively underexplored. Here, we formulate quantum link operation as a joint control problem over tunable rate-fidelity tradeoffs and uncontrollable link drift. From this framework, we construct a link control protocol that dynamically adapts source pump power and polarization compensation to maximize entanglement distribution rate subject to a minimum fidelity constraint. We evaluate the protocol through trace-driven simulations driven by data from a 64 km deployed optical fiber. Compared with optimized static policies, our adaptive controller improves mean entanglement distribution rate by 14% over a 24 hour trace, without requiring any offline policy optimization. Our results show that software-based physical layer control can provide a practical mechanism for improving near-term quantum link performance without requiring additional quantum hardware.
Comments27 pages, 12 figures, 1 table
