Quantum Communication

This course offers a comprehensive introduction to quantum communication, a groundbreaking approach to secure and ultra-efficient information transfer that leverages the principles of quantum mechanics. Designed for engineers, researchers, and professionals in communication and photonics, the course explores both theoretical foundations and practical implementations of quantum communication systems.

• Introduction to Quantum Information Theory: Classical vs. quantum information, qubits and quantum states, Bloch sphere representation, density matrices, and basic linear algebra for quantum systems.
• Fundamental Quantum Principles: Superposition, entanglement, uncertainty principle, quantum measurement theory, no-cloning theorem, and decoherence mechanisms.
• Quantum Key Distribution (QKD) Protocols: BB84, E91, B92, decoy-state and continuous-variable QKD, security proofs at a high level, eavesdropping strategies, and countermeasures.
• Quantum Channels and Noise Modeling: Loss, depolarization, phase damping, dark counts, background noise, and error sources in fiber, free-space, and satellite quantum links.
• Photon Sources and Detectors: Weak coherent sources, single-photon emitters, SPDC processes, avalanche photodiodes (APDs), superconducting nanowire single-photon detectors (SNSPDs), timing jitter, efficiency, and practical hardware trade-offs.
• Performance Metrics and Analysis: QBER, sift probability, secret key rate (SKR), link budget considerations, and distance–rate trade-offs.
• Quantum Repeaters and Memories: Entanglement swapping, purification concepts, quantum storage technologies, and scalability challenges for long-distance networks.
• Network Architectures and Integration: Fiber-based, free-space, and satellite quantum communication systems; hybrid classical–quantum coexistence, synchronization, and key management.
• Experimental Implementations and Case Studies: Laboratory setups, field trials, metropolitan QKD networks, and recent industrial and academic breakthroughs.
• Emerging Directions: Quantum internet concepts, device-independent QKD, post-quantum cryptography interaction, AI-assisted noise mitigation, and future quantum-secure communication ecosystems.

• Optical and photonics engineers working with single-photon sources, detectors, and secure optical links

• Communication system engineers interested in next-generation secure transmission technologies

• Researchers and graduate students in quantum physics, electrical/electronics engineering, photonics, and applied mathematics

• Cybersecurity and cryptography professionals exploring quantum-safe and quantum-enabled security methods

• Satellite and space communication engineers involved in long-distance or space-based quantum links

• R&D teams and technology innovators developing quantum networking, sensing, or advanced optical systems

• Academics and educators seeking structured material for teaching or curriculum development in quantum technologies