Secure Communication in Multi-Subnetwork by QKD Protocol with Entanglement and Decoy States

Abstract

Abstract This research focuses on enhancing secure quantum communication in multi-subnetwork environments, specifically focusing on vulnerabilities associated with quantum key distribution (QKD) protocols. The study uses an in-depth analysis of the decoy state strategy within the QKD protocol, quantifying security parameters and proposing dynamic recalibration strategies based on quantum channel parameters. Sensitivity analyses are used to assess the impact of variations in attenuation coefficient, detector efficiency, and the fraction of rounds with eavesdropping attempts. A dynamic adaptation mechanism is introduced to optimize the choice between entangled and decoy states over time. The research reveals modest disclosures into the vulnerabilities of quantum communication channels and offers dynamic recalibration strategies to ensure ongoing security against quantum threats. Quantitative metrics, such as the quantum key rate (QKR) and information leakage (SKR), are presented, providing a comparative analysis between entangled and decoy states. The findings highlight the efficacy of the proposed multi-subnetwork QKD protocol in mitigating external threats and adapting to evolving quantum environments. The research contributes to the field by providing a comprehensive understanding of security parameters influencing QKD protocols and paving the way for improved quantum communication protocols with applications in secure information transfer.