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arXiv · 2604.22232

A Simulation Framework for Noise and Error-Correction Analysis in Device-Independent Quantum Key Distribution

Nguyen Duong Hoang Duy·Nguyen Trinh Dong·Vu Tuan Hai·Le Vu Trung Duong·Nguyen Van Tinh
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Abstract

Device-Independent Quantum Key Distribution (DIQKD) certifies security from the violation of a Bell inequality alone, but its practical margin against noise is narrow and is usually quoted only through the Bell violation itself. We build a simulator of the event-ready DIQKD experiment and use it to trace readout noise through the Bell test into classical post-processing. For a symmetric outcome-flip channel of strength $e$, we reproduce the simulated violation window e<5.86%, to within $0.11$ percentage points. Combining these with a multi-pass Cascade reconciliation and the Devetak-Winter bound gives r<=0.162 bits per round, and shows that a positive key rate requires e<0.89 - roughly one-sixth of the window in which a Bell violation is still observed. The gap quantifies how far certified nonlocality overstates the usable noise budget of a DIQKD link.

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Nguyen Duong Hoang Duy, Nguyen Trinh Dong, Vu Tuan Hai, Le Vu Trung Duong, Nguyen Van Tinh. 2026-09-19. A Simulation Framework for Noise and Error-Correction Analysis in Device-Independent Quantum Key Distribution. https://arxiv.org/abs/2604.22232

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