Approximate recovery and relative entropy I. general von Neumann subalgebras
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We prove the existence of a universal recovery channel that approximately recovers states on a v. Neumann subalgebra when the change in relative entropy, with respect to a fixed reference state, is small. Our result is a generalization of previous results that applied to type-I v. Neumann algebras by Junge at al. [arXiv:1509.07127]. We broadly follow their proof strategy but consider here arbitrary v. Neumann algebras, where qualitatively new issues arise. Our results hinge on the construction of certain analytic vectors and computations/estimations of their Araki-Masuda $L_p$ norms. We comment on applications to the quantum null energy condition.
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Cited by 2 Pith papers
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Sufficiency and Petz recovery for positive maps
Minimal sufficient Jordan algebras generated by Neyman-Pearson tests characterize sufficiency for positive trace-preserving maps, implying Petz-like recovery and equivalence of interconversion conditions for quantum d...
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Sufficiency and Petz recovery for positive maps
Minimal sufficient Jordan algebras characterize sufficiency for positive trace-preserving maps on quantum states, with Neyman-Pearson tests generating them and equality in data-processing inequalities implying Petz recovery.
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