Quantum systems is the academic research field dedicated to studying physical entities whose behavior necessitates description by quantum mechanics. This concept investigates the fundamental properties, dynamics, and interactions of matter and energy at scales where quantum effects are dominant, such as atomic, molecular, and subatomic levels, characterized by phenomena like superposition, entanglement, and quantization of observables. Its significance is fundamental to modern physics, underpinning our understanding of the natural world and enabling advanced technological applications.