• Abhishek Saini
• Dr. Naresh Kumar

As quantum computing advances threaten classical cryptographic systems, ensuring secure communication has become a paramount concern across sectors such as finance, defense, and healthcare. This study investigates Quantum Key Distribution (QKD), particularly the BB84 protocol, as a foundation for quantum-safe communication. Emphasizing the limitations posed by quantum bit error rate (QBER) and photon loss over extended distances, the research proposes a simulation-based framework using IBM’s Qiskit to optimize BB84 performance in realistic conditions. The study integrates advanced noise modeling—including depolarization, dark counts, and detector inefficiencies—and introduces a novel Hybrid Adaptive Error Correction (HAEC) scheme. HAEC dynamically adjusts block sizes and uses predictive clustering algorithms to reduce QBER while sustaining efficient key generation over distances up to 200 km. By addressing real-world deployment challenges such as cost, scalability, and compatibility with classical infrastructure, this work bridges the gap between theoretical cryptography and practical quantum communication, contributing significantly to the development of resilient, quantum-secure networks.

Quantum Key Distribution (QKD), BB84 Protocol Quantum Cryptography,Quantum Cryptography,Quantum Communication,Long-Distance Quantum Networking

"Quantum-Safe Communication: A Simulation-Based Approach to Improving BB84 with Adaptive Error Correction for Extended Fiber-Optic Networks ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 7, page no.k929-k989, July-2025, Available :http://www.jetir.org/papers/JETIRTHE2216.pdf

"Quantum-Safe Communication: A Simulation-Based Approach to Improving BB84 with Adaptive Error Correction for Extended Fiber-Optic Networks ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 7, page no. ppk929-k989, July-2025, Available at : http://www.jetir.org/papers/JETIRTHE2216.pdf