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A quantum version of Sanov's theorem

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arxiv quant-ph/0412157 v1 pith:I7SMNOLI submitted 2004-12-20 quant-ph math-phmath.MPmath.PR

classification quant-phmath-phmath.MPmath.PR
keywords quantumseparatingcasestatetheoremchosenclassicalproduct
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abstract

We present a quantum extension of a version of Sanov's theorem focussing on a hypothesis testing aspect of the theorem: There exists a sequence of typical subspaces for a given set $\Psi$ of stationary quantum product states asymptotically separating them from another fixed stationary product state. Analogously to the classical case, the exponential separating rate is equal to the infimum of the quantum relative entropy with respect to the quantum reference state over the set $\Psi$. However, while in the classical case the separating subsets can be chosen universal, in the sense that they depend only on the chosen set of i.i.d. processes, in the quantum case the choice of the separating subspaces depends additionally on the reference state.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Maximum channel entropy principle and microcanonical channels

    quant-ph 2025-08 unverdicted novelty 7.0 of 10

    A maximum-entropy principle for quantum channels yields thermal channels with exponential form, analogous to thermal states.

  2. The Quantum Mechanics of Rare Events: From Quantum Walks to Stochastic Inflation

    hep-th 2026-08 conditional novelty 5.0 of 10

    Rare fluctuations in quantum walks are ruled by a measurement-induced relative entropy, and applying this to stochastic inflation yields a steady state that violates detailed balance.

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