Quantum key distribution protocols secured against independent attacks with one-way communication have been found to exhibit notable resilience to noise. Researchers have developed a noise-based metric to quantify the efficiency of single-qubit QKD protocols, enabling the analysis of maximal noise levels that allow for secure key distillation. This framework permits the evaluation of the robustness of QKD protocols against eavesdropping attacks, with a focus on the scenario where Alice and Bob engage in one-way classical communication. The introduction of this metric facilitates a more nuanced understanding of the interplay between noise and security in QKD protocols1. By examining the threshold beyond which noise compromises the security of key distribution, this research contributes to the development of more robust QKD systems. This matters to practitioners because understanding the noise resilience of QKD protocols is crucial for designing and implementing secure quantum communication systems.