Fermi golden rule decoherence: Γ = (2π/ℏ) |⟨f|V|i⟩|² ρ(E_f)

Layer 1 — Physicsin the open-quantum-systems subtree

Dirac 1927 / Fermi 1950 golden rule: transition rate from initial eigenstate |i⟩ of H₀ to a continuum / quasi-continuum of final states {|f⟩} under a weak perturbation V̂ is Γ_{i→f} = (2π/ℏ)·|⟨f|V̂|i⟩|²·ρ(E_f) — proportional to the squared…

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