Noise Resilient 1SDIQKD for Practical Quantum Networks

• URL: http://arxiv.org/abs/2602.00916v1
• Date: Sat, 31 Jan 2026 21:59:39 GMT
• Title: Noise Resilient 1SDIQKD for Practical Quantum Networks
• Authors: Syed M Arslan, Muhammad T Rahim, Asad Ali, Hashir Kuniyil, Saif Al Kuwari,
• Abstract summary: One-sided device-independent quantum key distribution (1-QKD) offers practical middle ground between fully device-independent protocols and standard QKD.<n>We extend the 1-QKD framework to include amplitude damping, dephasing, and depolarizing noise, quantifying their impact on secure key rates and efficiency requirements.
• Score: 0.9590956574213351
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: One-sided device-independent quantum key distribution (1SDI-QKD) offers a practical middle ground between fully device-independent protocols and standard QKD, achieving security with detection efficiencies as low as 50.1\% on the untrusted side. However, prior analyses assumed idealized channels, neglecting realistic noise sources. We extend the 1SDI-QKD framework to include amplitude damping, dephasing, and depolarizing noise, quantifying their impact on secure key rates and efficiency requirements. Our results reveal a clear noise hierarchy: dephasing is most tolerable (secure keys achievable at 70\% efficiency with 30\% noise), while amplitude damping and depolarizing noise dramatically elevate requirements to over 90\%. Crucially, we find that security is lost while substantial entanglement remains (concurrence $C \approx 0.7$--$0.8$), demonstrating that steering violation, not merely entanglement, determines 1SDI-QKD security. To mitigate noise effects, we integrate the BBPSSW entanglement purification protocol, showing that 2--4 rounds can restore positive key rates in otherwise insecure regimes. Our resource overhead analysis reveals that effective key rates peak at moderate purification depths; excessive rounds become counterproductive. These findings establish practical boundaries for deploying 1SDI-QKD over metropolitan-scale quantum networks.

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