Source-Replacement Model for Phase-Matching Quantum Key Distribution

• URL: http://arxiv.org/abs/2309.17304v1
• Date: Fri, 29 Sep 2023 15:00:10 GMT
• Title: Source-Replacement Model for Phase-Matching Quantum Key Distribution
• Abstract summary: We study the security of the phase-matching protocol using an intuitive source-replacement model. As an application of this approach, we introduce a beam-splitting attack scheme.
• Score: 0.40964539027092917
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum key distribution has emerged as a promising solution for constructing secure communication networks, offering information-theoretic security guaranteed by the principles of quantum mechanics. One of the most advanced quantum key distribution protocols to date is the phase-matching protocol. Its security was initially established using an abstract method known as symmetry-protected privacy. In this study, we reevaluate the security of the phase-matching protocol using an intuitive source-replacement model, and we arrive at conclusions that align with the original proof. This model provides a fresh perspective on the protocol's security. As an application of this approach, we introduce a beam-splitting attack scheme. Leveraging the source-replacement model, we derive a lower bound on the phase error rate under this attack, further underscoring the robustness of our security analysis method.

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