Quantum AI Systems (QAIS), Volume II: Quantum Representation and Reasoning extends the foundational concepts introduced in Volume I and examines how information is represented, transformed, and reasoned about within quantum-enhanced intelligent systems. The volume explores quantum state spaces, information encoding, interference-driven representation, quantum reasoning frameworks, and the operational mechanisms that support decision-making within Quantum AI architectures. Designed for students, researchers, and professionals, this volume provides a systems-level perspective on how representation and reasoning form the foundation for learning, communication, and governance capabilities developed throughout the QAIS series.