Where Did the Qubit Superposition Equation Come From?
The familiar qubit equation |ψ⟩ = α|0⟩ + β|1⟩ was not invented as a standalone formula by one person. This note follows the question of where it came from, connecting classical wave superposition, Schrödinger's linear wave mechanics, Dirac's abstract state notation, and the later language of qubits.
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