请为我解释一下量子力学的基本原理，并提供三个关键概念，要求回答必须使用英文排比句式，每个概念不能超过七个词。
user
Quantum mechanics, a fundamental theory, describes nature at the smallest scales. It revolutionized our understanding of the physical universe, introducing concepts that challenged classical physics.

Three key concepts in quantum mechanics are: Wave-particle duality, Heisenberg uncertainty principle, superposition state. These concepts highlight the unique and sometimes counterintuitive nature of quantum phenomena.
assistant