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Equation 5 · The Entry a Relabeling Cannot Write

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ρ\rho

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ρ\rho

Symbol ρ

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three Hermitian terms, each in units of energy: the system’s own generator, the bath’s own generator, and an interaction coupling the two. A fine state is a density operator ρ\rho on Hf\mathcal H_f — trace one, positive semidefinite, dimensionless as a probability object.

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