8 papers · 1 filter
Device independent quantum key distribution with robust self-tests
Andreas Bluhm, Gereon Koßmann, René Schwonnek
Device-independent quantum key distribution (DIQKD) provides a model of quantum key distribution with minimal assumptions and highly abstract theoretical building blocks. Although…
Entanglement cost of bipartite quantum channel discrimination under positive partial transpose operations
Chengkai Zhu, Shuyu He, Gereon Koßmann +1
Quantum channel discrimination is a fundamental task in quantum information processing. In the one-shot regime, discrimination between two candidate channels is characterized by th…
A Collection of Pinsker-type Inequalities for Quantum Divergences
Kläre Wienecke, Gereon Koßmann, René Schwonnek
Pinsker's inequality sets a lower bound on the Umegaki divergence of two quantum states in terms of their trace distance. In this work, we formulate corresponding estimates for a v…
Simultaneous variances of Pauli strings, weighted independence numbers, and a new kind of perfection of graphs
Zhen-Peng Xu, Jie Wang, Qi Ye +3
A set of Pauli stings is well characterized by the graph that encodes its commutatitivity structure, i.e., by its frustration graph. This graph provides a natural interface between…
Routed Bell tests with arbitrarily many local parties
Gereon Koßmann, Mario Berta, René Schwonnek
Device-independent quantum key distribution (DIQKD) promises cryptographic security based solely on observed quantum correlations, yet its implementation over long distances remain…
On approximate quantum error correction for symmetric noise
Gereon Koßmann, Julius A. Zeiss, Omar Fawzi +1
We revisit the extendability-based semi-definite programming hierarchy introduced by Berta et al. [Mathematical Programming, 1 - 49 (2021)], which provides converging outer bounds…