The Quantum-Blockchain Fusion Framework (QBFF) introduces a pioneering solution for dynamic access control in federated grid computing systems. Addressing critical challenges in security, scalability, and adaptability, QBFF combines quantum key distribution (QKD) for secure communication with blockchain technology for decentralized identity management and policy enforcement. The framework employs a hybrid consensus mechanism, integrating proof-of-authority and quantum randomness to enhance efficiency while maintaining robust security. Experimental results demonstrate significant improvements in transaction throughput, reduced latency, and resilience against cyber threats like identity spoofing and consensus manipulation. QBFF also supports dynamic policy updates with real-time adaptability, enabling scalable and efficient operations in distributed environments. This research establishes QBFF as a comprehensive solution for modern grid systems, ensuring security and scalability in the face of evolving technological demands.

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