AI 中文总结
该研究提出基于经典与量子关联的亚真空关联干扰协议，可在保留对窃听者干扰的同时抑制合法接收者自干扰，提升物理层安全，适用于多类安全通信场景。
AI 中文摘要
人工噪声干扰通过降低窃听者的信道来提升物理层安全，但注入的噪声也会干扰合法接收者。我们提出一种基于经典和量子关联的关联干扰协议，该协议在保留对窃听者的干扰惩罚的同时抑制这种自干扰。Bob广播关联双模源的一个模式，将第二个模式保留为本地参考。无法访问保留模式的Eve会接收到完整的热干扰场，而Bob使用优化的联合测量来抵消其关联波动。残余自干扰噪声由在保留参考条件下传输的干扰正交分量的条件方差决定。任何经典关联源都受限于真空噪声底，因此最多只能将Bob恢复到其未受干扰的接收噪声。纠缠双模压缩源可超越该极限，产生亚真空残余噪声，最大量子优势由干扰路径回传到Bob的透射率决定。在亮源机制下，该优势成为Bob噪声底的固定降低量，与信号和干扰功率无关。在有界收集窃听模型中，即使Eve拥有比Bob更强的直接信道，该关联干扰仍能保持正保密率，且对Eve高斯输出态的集体测量仍有效。该协议支持亮经典消息传输，无需端到端量子信道，潜在应用包括散粒噪声受限光通信、低温微波网络以及隐蔽或功率受限的安全链路。
英文摘要
Artificial-noise jamming improves physical-layer security by degrading an eavesdropper's channel, but the injected noise also interferes with the legitimate receiver. We introduce a correlated-jamming protocol based on classical and quantum correlations that suppresses this self-interference while preserving the jamming penalty experienced by the eavesdropper. Bob broadcasts one mode of a correlated two-mode source and retains the second as a local reference. Eve, who has no access to the retained mode, receives the full thermal jamming field, whereas Bob uses an optimized joint measurement to cancel its correlated fluctuations. The residual self-jamming noise is governed by the conditional variance of the transmitted jamming quadrature given the retained reference. Any classically correlated source is bounded by the vacuum-noise floor and therefore restores Bob, at best, to his unjammed receiver noise. An entangled two-mode squeezed source surpasses this limit and produces sub-vacuum residual noise, with the maximum quantum advantage set by the transmissivity of the jamming path back to Bob. In the bright-source regime, this advantage becomes a fixed reduction in Bob's noise floor, independent of the signal and jamming powers. Within a bounded-collection wiretap model, correlated jamming preserves positive secrecy even when Eve has a stronger direct channel than Bob and remains effective against collective measurements on Eve's Gaussian output states. The protocol supports bright classical message transmission and requires no end-to-end quantum channel. Possible applications include shot-noise-limited optical communication, cryogenic microwave networks, and covert or power-constrained secure links.
