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def definition def or abbrev

probability

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formal statement (Lean)

 154noncomputable def probability {n : ℕ} (ψ : QuantumState n) (i : Fin n) : ℝ :=

proof body

Definition body.

 155  Complex.normSq (ψ.amplitudes i)
 156
 157/-- Probabilities are non-negative. -/

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