Protocol-level description and self-contained security proof of decoy-state BB84 QKD protocol

• URL: http://arxiv.org/abs/2504.20417v1
• Date: Tue, 29 Apr 2025 04:28:15 GMT
• Title: Protocol-level description and self-contained security proof of decoy-state BB84 QKD protocol
• Authors: Akihiro Mizutani, Toshihiko Sasaki, Go Kato,
• Abstract summary: We present a self-contained information-theoretic security proof for the decoy-state BB84 quantum key distribution protocol.<n>Our proof yields a key rate consistent with previous findings.
• Score: 1.0923877073891446
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this paper, we present a flowchart-based description of the decoy-state BB84 quantum key distribution (QKD) protocol and provide a step-by-step, self-contained information-theoretic security proof for this protocol within the universal composable security framework. As a result, our proof yields a key rate consistent with previous findings. Importantly, unlike all the prior security proofs, our approach offers a fully rigorous and mathematical justification for achieving the key rate with the claimed correctness and secrecy parameters, thereby representing a significant step toward the formal certification of QKD systems.

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