On the Interplay Between Noise, Bell Violation, and Cascade Error Correction in Device-Independent Quantum Key Distribution

• URL: http://arxiv.org/abs/2604.22232v1
• Date: Fri, 24 Apr 2026 05:17:59 GMT
• Title: On the Interplay Between Noise, Bell Violation, and Cascade Error Correction in Device-Independent Quantum Key Distribution
• Abstract summary: Device-Independent Quantum Key Distribution (DIQKD) provides information-theoretic security by relying solely on the violation of Bell inequalities.<n>Practical implementations of DIQKD are highly sensitive to noise.<n>This work investigates the impact of noise on the Clauser-Horne-Shimony-Holt (CHSH) value and evaluates the effectiveness of Cascade error correction.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Device-Independent Quantum Key Distribution (DIQKD) provides information-theoretic security by relying solely on the violation of Bell inequalities, eliminating the need to trust the quantum devices. However, practical implementations of DIQKD are highly sensitive to noise. Efficient error correction during the classical post-processing stage is important for improving the fidelity. This work investigates the impact of noise on the Clauser-Horne-Shimony-Holt (CHSH) value and evaluates the effectiveness of Cascade error correction. The protocol is applied iteratively to correct errors via parity checking and binary search procedures. Simulation results show that noise significantly degrades the CHSH value, reducing the strength of nonlocal correlations required for secure DIQKD. Nevertheless, Cascade reduces the error ratio, and most corrections occur within the first several rounds. These findings highlight the importance of classical error correction in improving DIQKD systems.

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