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Quantum superposition is a fundamental principle of quantum mechanics.

Just like waves in classical physics, two quantum states can be added together and the result will be another valid quantum state.

Conversely, each quantum state can be represented as a sum of two or more other distinct states.

Mathematically, it refers to a property of solutions of Schrödinger's equation since Schrödinger's equation is linear.

Any linear combination of solutions will also be a solution.

In quantum mechanics, the principle of superposition stipulates that the same quantum state can have several values.