Author

Marco Tomamichel

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Preprint Sep 2026

Sharp Data-Processing Region for Quantum Conditional R\'enyi Entropies

We study the three-parameter family of quantum conditional R\'enyi entropies $H_{\alpha,z}^\lambda$ introduced in \textit{Commun. Math. Phys.} 407, 180 (2026). We prove that the previously established data-processing region is sharp. We then characterize the club-sandwiched family through a classical coarse-graining pr...

M. M. Goodarzi, Yu-Cheng Bao, Marco Tomamichel · 0 citations

Preprint Sep 2026

On the Power of Adaptivity in Testing Quantum States in Fidelity

We study the problems of quantum state certification, equivalence testing and independence testing. In certification, given samples of an unknown quantum state $\rho$ and the description of a state $\sigma$, the goal is to test whether $\rho=\sigma$, or whether $\rho$ and $\sigma$ are far in a given distance measure. I...

Jan Seyfried, Sayantan Sen, Marco Tomamichel · 0 citations

Preprint Sep 2026

Monotonicity of the R\'enyi channel capacity under non-signaling assisted channel simulation

We ask whether non-signaling correlations shared between the sender and receiver can increase the R\'enyi capacity of a classical channel. Non-signaling boxes form a strictly larger class than that of encoder and decoder pairs assisted by shared randomness, so the usual argument based on independent preprocessing and p...

Tina Shariat, Matt Hoogsteder-Riera, Marco Tomamichel · 0 citations