For a qubit model of Bell-pair Hawking emission, the per-step change in radiation entanglement entropy is bounded between (1-4*epsilon2^2-sqrt(1-gamma^2))*log2 and sqrt(1-4*epsilon2^2)*log2, yielding an early Page-curve turnover that is incompatible with unitary evaporation.
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Modifications of the Page Curve from correlations within Hawking radiation
For a qubit model of Bell-pair Hawking emission, the per-step change in radiation entanglement entropy is bounded between (1-4*epsilon2^2-sqrt(1-gamma^2))*log2 and sqrt(1-4*epsilon2^2)*log2, yielding an early Page-curve turnover that is incompatible with unitary evaporation.