Quantum noise kills entanglement forever but can resurrect magic

When GHZ states decay under amplitude damping, entanglement dies and stays dead — but 'magic' (the resource that makes quantum computers hard to simulate classically) can vanish and then spontaneously return at a higher noise level. The two critical noise strengths always sum to exactly one, a precise duality linking the quantum system to its environment. Remarkably, the reborn magic can live in a fully separable state and be harvested onto a single qubit for quantum computation, suggesting dissipation is not purely an enemy of quantum resources.