Noise Resilience of Quantum Key Distribution Protocols Secured Against Independent Attacks With One-Way Communication

• URL: http://arxiv.org/abs/2607.11857v1
• Date: Mon, 13 Jul 2026 17:42:52 GMT
• Title: Noise Resilience of Quantum Key Distribution Protocols Secured Against Independent Attacks With One-Way Communication
• Abstract summary: We introduce a noise-based metric that quantifies the efficiency of QKD protocols.<n>We compare the noise tolerance of general single-qubit QKD protocols.<n>We demonstrate that the six-state protocol achieves the greatest resistance to noise.
• Score: 1.8716489049729736
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the resilience to noise of single-qubit quantum key distribution (QKD) protocols in the scenario of security against independent eavesdropping attacks and key distillation based on one-way classical communication. To this end, we introduce a noise-based metric that quantifies the efficiency of QKD protocols. Within this framework, we analyze the maximal noise levels that allow Alice and Bob to asymptotically establish a secure secret key. Using this assumption, we compare the noise tolerance of general single-qubit QKD protocols, in particular the BB84, B92, E91, and six-state protocols. Our main result determines the noise level threshold for QKD allowing one to distill an asymptotically secure secret key. Additionally, we demonstrate that the six-state protocol achieves the greatest resistance to noise while simultaneously yielding a higher post-selection efficiency than the other analyzed single-qubit protocols, confirming its robustness within the considered security model. Finally, we perform an analysis of the proposed noise-based metric and the conventional quantum bit error rate (QBER) metric.

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