Author

Kuan-Yi Lee

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Preprint Sep 2026

Generalised quantum Stein's lemma more robust than ever

The generalised quantum Stein's lemma is a key result in quantum hypothesis testing, and connects this fundamental primitive of quantum information processing with quantum resource manipulation, a task that is central for technological applications. Prior works have proved this statement in the idealised setting of ind...

Filippo Girardi, Kuan-Yi Lee, Masahito Hayashi et al. · 3 citations

Preprint Sep 2026

Sharp pairwise reduction for quantum hypothesis testing

We determine the optimal universal coefficient in a reduction of multiple to binary quantum hypothesis testing. Specifically, for every finite ensemble in any Hilbert space dimension (finite or infinite), we prove that the error probability of the global pretty good measurement (PGM) is at most four times the sum of th...

Kuan-Yi Lee, Ludovico Lami · 0 citations