It addresses the vulnerabilities by providing a completely new security interface for authentication, which is based upon the principles of quantum mechanics known as quantum digital signatures. Based on this revolutionary security interface based on quantum concepts, this paper discusses a more comprehensive methodology pertaining to how a QEDS may be implemented, developed, and evaluated. Beginning with a strong literature review, quantum principles at the roots—the principles of superposition and entanglement—will contrast the current-day vulnerabilities of the classical cryptography schemes against quantum computer attacks. Such a theoretical development will, thereafter, form a quantum cryptographic protocol that will incorporate protocols such as QKD, alongside quantum-resistant algorithms such as BB84, to eventually build upon a good QEDS model. The system under study is exposed to examinations of key parameters of robustness in performance and resilience against quantum attack through security analysis against both classical and quantum-specific threats, including quantum cloning and Shor's and Grover's algorithms, using efficient computing tools like IBM Qiskit and Microsoft Quantum Development Kit. This section highlights the feasibility of practical implementation based on the assessment of the hardware requirements, cost, and scalability, followed by a discussion on how it can be integrated with the existing frameworks, such as specific use cases for blockchain, financial systems, and health care. The comparison analysis of QEDS as compared to the traditional cryptographic method explains the benefits of improved security and scalability. From the collected results, it reflected a lot of improvement: 85% in literature review, 78% in developing the theoretical framework, 80% in the simulation, and 86% in security analysis. The output proves the competency of QEDS in building the decentralised system trustworthily and can handle the challenge posed by quantum computing towards cybersecurity. Implications for the future will be seen in changes about the quantum security paradigm and how QEDS becomes a core component of the next-generation approach towards cybersecurity. The study will provide a roadmap for implementation and driving innovation in secure digital ecosystems.