281 citations · 1k across the 9 of their papers we have counts for
9 papers
Bounding the quantum dimension with contextuality
Otfried Gühne, Costantino Budroni, Adan Cabello +2
We show that the phenomenon of quantum contextuality can be used to certify lower bounds on the dimension accessed by the measurement devices. To prove this, we derive bounds for d…
Two-setting Bell Inequalities for Graph States
Geza Toth, Otfried Guehne, Hans J. Briegel
We present Bell inequalities for graph states with high violation of local realism. In particular, we show that there is a two-setting Bell inequality for every nontrivial graph st…
Addendum to "Sufficient conditions for three-particle entanglement and their tests in recent experiments"
Geza Toth, Otfried Guehne, Michael Seevinck +1
A recent paper [M. Seevinck and J. Uffink, Phys. Rev. A 65, 012107 (2002)] presented a bound for the three-qubit Mermin inequality such that the violation of this bound indicates g…
Relations between Entanglement Witnesses and Bell Inequalities
P. Hyllus, O. Guehne, D. Bruss +1
Bell inequalities, considered within quantum mechanics, can be regarded as non-optimal witness operators. We discuss the relationship between such Bell witnesses and general entang…
Multipartite entanglement in spin chains
Otfried Guehne, Geza Toth, Hans J. Briegel
We investigate the presence of multipartite entanglement in macroscopic spin chains. We discuss the Heisenberg and the XY model and derive bounds on the internal energy for systems…
Entanglement Detection in the Stabilizer Formalism
Geza Toth, Otfried Guehne
We investigate how stabilizer theory can be used for constructing sufficient conditions for entanglement. First, we show how entanglement witnesses can be derived for a given state…