AI 中文总结
本文提出一种本质抗侧信道攻击的确定性QKD源，无需脉冲后选择或完美消光比设备，可简化安全证明并提升密钥率，为实现安全QKD提供实用路径。
AI 中文摘要
量子密钥分发（QKD）原则上是安全的，但实际安全性可能因真实设备与安全证明中假设的理想模型存在差异而受损。源侧信道（包括被特洛伊木马攻击利用的那些）危害尤其大：忽略它们会破坏实现安全性，而考虑它们会降低性能。本文提出一种本质上抗侧信道攻击的QKD源，与现有的无源和无调制器方案不同，它既不需要对发射脉冲进行后选择，也不需要具有完美消光比的设备来抑制侧信道，且不会在强度与编码比特或基之间引入关联。因此，更简单的安全证明可直接应用，产生显著更高的密钥率。该方案似乎在当前技术可实现范围内，为实现安全的QKD提供了清晰实用的途径。
英文摘要
Quantum key distribution (QKD) is secure in principle, but practical security can be undermined by discrepancies between real devices and the idealized models assumed in security proofs. Source side channels, including those exploited by Trojan-horse attacks, are particularly detrimental: neglecting them compromises implementation security, whereas accounting for them reduces performance. Here we propose a QKD source that is intrinsically robust against side-channel attacks. Unlike existing passive and modulator-free schemes, it requires neither post-selection of the emitted pulses nor devices with a perfect extinction ratio to suppress side channels, and it does not introduce correlations between the intensity and the encoded bit or basis. Consequently, under idealized source assumptions commonly adopted in proposals for existing schemes, conventional decoy-state security analyses apply directly, yielding substantially higher key rates. Our proposal appears to be within reach of current technology and therefore provides a clear and practical path toward implementation-secure QKD.
Comments7 pages, 3 figures
