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Min-reflected entropy = doubly minimized Petz Renyi mutual information of order 1/2

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arxiv 2502.18433 v1 pith:C3P2QTE7 submitted 2025-02-25 quant-ph hep-th

classification quant-phhep-th
keywords renyientropyinformationordercorrelationdoublyfieldmeasure
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Renyi reflected entropies of order $n \geq 2$ are correlation measures that have been introduced in the field of holography. In this work, we put the spotlight on the min-reflected entropy, i.e., the Renyi reflected entropy in the limit $n \rightarrow \infty$. We show that, for general bipartite quantum states, this measure is identical to another measure originating from the field of quantum information theory: the doubly minimized Petz Renyi mutual information of order $1/2$. Furthermore, we demonstrate how this equality enables us to answer several previously open questions, each concerning one of the two correlation measures (or generalizations of them).

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  1. Alternating minimization for computing doubly minimized Petz Renyi mutual information

    quant-ph 2025-07 accept novelty 7.0 of 10

    Alternating minimization provably computes the doubly minimized Petz Rényi mutual information for all quantum states, with linear convergence for α∈(1,2] and O(1/n) convergence for α∈(1/2,1).

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