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Quantum Key Distribution Security Protocol Based on Quantum Decoherence

Jincheng Zhang

Published Sep 4, 2026• 0 citations
Publisher

Abstract

This paper investigates a novel quantum key distribution (QKD) protocol leveraging the principles of quantum decoherence to significantly enhance security against eavesdropping attacks. The core concept involves exploiting the inherent fragility of quantum states due to decoherence, introducing controlled noise to disrupt the eavesdropper's ability to intercept and decode the key. The proposed protocol, termed "Decoherence-Enhanced QKD" (DE-QKD), aims to bolster the security of existing QKD schemes by amplifying the impact of any attempt to observe the quantum key transmission. Mathematical formulations detail the key components, including the polarization encoding, the measurement process, and the key distillation steps, highlighting the protocol's robustness. The analysis demonstrates a substantial increase in security margins compared to conventional QKD protocols, particularly in the presence of imperfect devices and realistic noise conditions. This work contributes to the ongoing research in secure quantum communication and provides a practical pathway for deploying more resilient QKD systems. ---

DOI
10.5281/zenodo.22293791

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This paper investigates a novel approach to quantum key distribution (QKD) leveraging the phenomenon of quantum decoherence. Traditional QKD protocols, while theoretically secure, are susceptible to various attacks, often relying on the assumption of perfect quantum state preservation. This research proposes a framework for distributed key generation utilizing the inherent limitations imposed by quantum decoherence. The core concept involves encoding key information within quantum states that are deliberately designed to be vulnerable to decoherence. This vulnerability, rather than being a weakness, is exploited to introduce a level of inherent security, effectively masking the key's true value from an eavesdropper attempting to intercept and measure the quantum states. We explore the mathematical formalization of this process, detailing the generation of entangled states, the measurement protocols, and the key distillation process, all incorporating the effects of decoherence. The proposed system offers a potentially more robust defense against sophisticated attacks by introducing a naturally occurring element of uncertainty. This work provides a foundational understanding of utilizing decoherence as a key component within a QKD architecture. ---
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This paper presents a novel Quantum Key Distribution (QKD) protocol leveraging the phenomenon of quantum coherence dephasing to enhance security. The protocol, termed Coherence Dephasing Key Distribution (CDKD), utilizes the inherent fragility of quantum states to create a robust key exchange mechanism. The core principle involves encoding key information within a quantum state subject to dephasing, effectively mitigating the impact of eavesdropping attempts. Mathematical analysis demonstrates the protocol's resilience against various attack scenarios, particularly those exploiting known vulnerabilities in traditional QKD protocols. The proposed protocol offers a promising approach to secure key distribution, particularly in environments where sophisticated eavesdropping techniques are anticipated. The security relies on the fundamental uncertainty principle and the sensitivity of quantum states to environmental noise, specifically focusing on the dephasing process. The key equation governing the protocol is: E=ħωcos⁡(Δϕ)E = ħω \cos(\Delta \phi)E=ħωcos(Δϕ), where EEE is the energy, ħħħ is the reduced Planck constant, ω\omegaω is the angular frequency, and Δϕ\Delta \phiΔϕ is the phase difference. The protocol's security is fundamentally tied to maintaining a significant phase uncertainty, which is achieved through careful control of the quantum state and the introduction of appropriate dephasing mechanisms. This work provides a theoretical framework for the CDKD protocol and highlights its potential for practical implementation.
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