The strong converse exponent of composable randomness extraction against quantum side information
Quantum Physics
2026-01-28 v1
Abstract
We find a tight characterization of the strong converse exponent for randomness extraction against quantum side information. In contrast to previous tight bounds, we employ a composable error criterion given by the fidelity (or purified distance) to a uniform distribution in product with the marginal state. The characterization is in terms of a club-sandwiched conditional entropy recently introduced by Rubboli, Goodarzi and Tomamichel and used by Li, Li and Yu to establish the strong converse exponent for the case of classical side information. This provides the first precise operational interpretation of this family of conditional entropies in the quantum setting.
Cite
@article{arxiv.2601.19182,
title = {The strong converse exponent of composable randomness extraction against quantum side information},
author = {Roberto Rubboli and Marco Tomamichel},
journal= {arXiv preprint arXiv:2601.19182},
year = {2026}
}