Existence of a measurement realizing finite quantum relative entropy

Let ω1\omega_1 and ω2\omega_2 be states, let S(ω1\Vertomega2)S(\omega_1\Vertomega_2) denote their quantum relative entropy, and let M(ω1\precomega2)\mathrm{M}(\omega_1\precomega_2) be the set of measurement schemes used to obtain the corresponding central measures. Existence conjecture. If

S(ω1\Vertomega2)<,S(\omega_1\Vertomega_2)<\infty,

then

M(ω1\precomega2).\mathrm{M}(\omega_1\precomega_2)\neq\emptyset.

This would provide a statistical measurement framework for examining quantum relative entropy whenever it is finite. The source does not state any resolution, so the conjecture remains open.

Sources & referencesView supporting material

Primary source

Kazuya Okamura, “The Quantum Relative Entropy as a Rate Function and Information Criteria”, arXiv:1202.2943 (2012).

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