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Quantum hypothesis testing and sufficient subalgebras

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arxiv 0810.4045 v2 pith:MMF5AW7L submitted 2008-10-22 quant-ph

Quantum hypothesis testing and sufficient subalgebras

classification quant-ph
keywords quantumsufficiencysufficientotimesstatessubalgebrabayescases
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We introduce a new notion of a sufficient subalgebra for quantum states: a subalgebra is 2- sufficient for a pair of states $\{\rho_0,\rho_1\}$ if it contains all Bayes optimal tests of $\rho_0$ against $\rho_1$. In classical statistics, this corresponds to the usual definition of sufficiency. We show this correspondence in the quantum setting for some special cases. Furthermore, we show that sufficiency is equivalent to 2 - sufficiency, if the latter is required for $\{\rho_0^{\otimes n},\rho_1^{\otimes}\}$, for all $n$.

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    math.OA 2026-07 accept novelty 7.0

    The f_0-divergence defined via Jordan decomposition integrals coincides with Araki's relative entropy on arbitrary von Neumann algebras, extending Frenkel's finite-dimensional formula.