QKD security proofs for decoy-state BB84: protocol variations, proof techniques, gaps and limitations

• URL: http://arxiv.org/abs/2502.10340v1
• Date: Fri, 14 Feb 2025 18:02:30 GMT
• Title: QKD security proofs for decoy-state BB84: protocol variations, proof techniques, gaps and limitations
• Authors: Devashish Tupkary, Ernest Y. -Z. Tan, Shlok Nahar, Lars Kamin, Norbert Lütkenhaus,
• Abstract summary: We discuss the status of security proofs for practical decoy-state Quantum Key Distribution using the BB84 protocol.<n>Our focus is on the gaps in the existing literature.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We discuss the status of security proofs for practical decoy-state Quantum Key Distribution using the BB84 protocol, pertaining to optical implementations using weak coherent pulses and threshold photo-detectors. Our focus is on the gaps in the existing literature. Gaps might result, for example, from a mismatch of protocol detail choices and proof technique elements, from proofs relying on earlier results that made different assumptions, or from protocol choices that do not consider real-world requirements. While substantial progress has been made, our overview draws attention to the details that still require our attention.

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