Author

Gereon Koßmann

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Preprint Aug 2026

Computing key rates for one-sided device-independent quantum key distribution

The defining feature of one-sided device-independent quantum key distribution is its asymmetric trust model in which only one party is characterized. This scenario sets an interesting middle ground between high key rates achievable by characterizing devices and the security of full device-independence. Here, we provide...

Andreas Bluhm, Gereon Koßmann, Martin Sandfuchs et al. · 0 citations

Preprint Aug 2026

Optimal strategies for shadow tomography with limited resources

Shadow tomography addresses the task of efficiently predicting many expectation values of an unknown quantum state from randomized measurements on comparatively few copies. Existing analyses promise large scaling advantages, but the optimal strategies realizing these guarantees are not always known, and the required me...

Zhen-Peng Xu, Qi Ye, Jie Wang et al. · 1 citation

Preprint Jul 2026

Fixed points in de Finetti hierarchies

De Finetti theorems convert permutation symmetry into approximate mixtures of product states and thereby justify a wide range of reductions in classical and quantum statistics. In this work we study de Finetti hierarchies in which the feasible states are additionally constrained to be fixed points of quantum channels,...

Gereon Koßmann, Julius A. Zeiss · 0 citations