Quantum Key Distribution Protocol Based on Quantum Coherence Dephasing

Abstract

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: $E = ħω \cos(\Delta \phi)$, where $E$ is the energy, $ħ$ is the reduced Planck constant, $\omega$ is the angular frequency, and $\Delta \phi$ 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.