Source-independent quantum key distribution without pre-sending entanglement

• URL: http://arxiv.org/abs/2604.28089v1
• Date: Thu, 30 Apr 2026 16:35:50 GMT
• Title: Source-independent quantum key distribution without pre-sending entanglement
• Abstract summary: We propose a source-independent (SI) QKD protocol that resolves all known and unknown source-side attacks without pre-sending entanglement source.<n>Our protocol simultaneously doubles the transmission distance while remaining robustness against imperfection of source.
• Score: 0.1669718661073505
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum key distribution (QKD) theoretically offers information-theoretic security. The prevailing approach is the prepare-and-measure BB84 protocol, which implements QKD using conventional laser rather than single-photon source via the decoy-state method. However, side-channel attacks targeting sources severely threaten system security. Despite extensive efforts, including fully passive scheme, this vulnerability persists even with perfect single-photon source. Here, we propose a source-independent (SI) QKD protocol that resolves all known and unknown source-side attacks without pre-sending entanglement source. Aligning with advances in quantum light sources, our protocol simultaneously doubles the transmission distance while remaining robustness against imperfection of source. Theoretical analysis shows that non-classical light source provides practical security advantages unattainable with conventional laser.

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