Equation 78 · The Entry a Relabeling Cannot Write
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Symbol omega
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A single exactly solvable case makes the ledger’s behavior concrete, and it is worth being explicit that what follows is an analytic evaluation of a stated model, not a simulation and not a measurement. Let S and B each be a two-level system — a spin, in the sense this literature uses the word for any two-state quantum degree of freedom — with bare Hamiltonians = (/2) and = (/2) tuned to the same frequency , coupled by an excitation-conserving exchange term,
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