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Koichi Yamagata

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Preprint Sep 2026

An attainable Gill-Massar-type bound for spin-factor models

We determine the exact local precision limits for single-copy estimation of smooth multiparameter quantum statistical models contained in spin factors, a class of matrix Jordan algebras whose state spaces generalize the qubit Bloch ball. At any parameter point where the symmetric logarithmic derivative (SLD) Fisher inf...

Koichi Yamagata · 0 citations

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