A quantum state is a state of a quantum system that can exist in a superposition of states, meaning that it can exist in multiple states simultaneously. A classical state, on the other hand, can only exist in one state at a time. In addition, the properties of a quantum state cannot be measured precisely without disturbing the state, due to the uncertainty principle of quantum mechanics, while the properties of a classical state can be measured precisely.\n
What is the difference between a quantum state and a classical state?