389 citations · 640 across the 6 of their papers we have counts for
6 papers · 1 filter
State-independent experimental test of quantum contextuality
G. Kirchmair, F. Zähringer, R. Gerritsma +5
The question of whether quantum phenomena can be explained by classical models with hidden variables is the subject of a long lasting debate. In 1964, Bell showed that certain type…
The geometric measure of entanglement for symmetric states
R. Hübener, M. Kleinmann, T. -C. Wei +2
Is the closest product state to a symmetric entangled multiparticle state also symmetric? This question has appeared in the recent literature concerning the geometric measure of en…
Entanglement witnesses and a loophole problem
Patrick Skwara, Hermann Kampermann, Matthias Kleinmann +1
We consider a possible detector-efficiency loophole in experiments that detect entanglement via the local measurement of witness operators. Here, only local properties of the detec…
Finite key analysis for symmetric attacks in quantum key distribution
Tim Meyer, Hermann Kampermann, Matthias Kleinmann +1
We introduce a constructive method to calculate the achievable secret key rate for a generic class of quantum key distribution protocols, when only a finite number n of signals is…
Physical Purification of Quantum States
M. Kleinmann, H. Kampermann, T. Meyer +1
We introduce the concept of a physical process that purifies a mixed quantum state, taken from a set of states, and investigate the conditions under which such a purification map e…
On the generalization of quantum state comparison
M. Kleinmann, H. Kampermann, D. Bruss
We investigate the unambiguous comparison of quantum states in a scenario that is more general than the one that was originally suggested by Barnett et al. First, we find the optim…