157 citations · 815 across the 35 of their papers we have counts for
6 papers · 1 filter
Can you sign a quantum state?
Gorjan Alagic, Tommaso Gagliardoni, Christian Majenz
Cryptography with quantum states exhibits a number of surprising and counterintuitive features. In a 2002 work, Barnum et al. argue that these features imply that digital signature…
Constraints on Multipartite Quantum Entropies
Christian Majenz
The von Neumann entropy plays a vital role in quantum information theory. The von Neumann entropy determines, e.g., the capacities of quantum channels. Also, entropies of composite…
Entropy in Quantum Information Theory -- Communication and Cryptography
Christian Majenz
In this Thesis, several results in quantum information theory are collected, most of which use entropy as the main mathematical tool. *While a direct generalization of the Shannon…
Asymptotic performance of port-based teleportation
Matthias Christandl, Felix Leditzky, Christian Majenz +3
Quantum teleportation is one of the fundamental building blocks of quantum Shannon theory. While ordinary teleportation is simple and efficient, port-based teleportation (PBT) enab…
Conditional Decoupling of Quantum Information
Mario Berta, Fernando G. S. L. Brandao, Christian Majenz +1
Insights from quantum information theory show that correlation measures based on quantum entropy are fundamental tools that reveal the entanglement structure of multipartite states…
Quantum-secure message authentication via blind-unforgeability
Gorjan Alagic, Christian Majenz, Alexander Russell +1
Formulating and designing authentication of classical messages in the presence of adversaries with quantum query access has been a longstanding challenge, as the familiar classical…