42 citations · 102 across the 3 of their papers we have counts for
3 papers
Computing complexity measures for quantum states based on exponential families
Sönke Niekamp, Tobias Galla, Matthias Kleinmann +1
Given a multiparticle quantum state, one may ask whether it can be represented as a thermal state of some Hamiltonian with k-particle interactions only. The distance from the expon…
Increasing the statistical significance of entanglement detection in experiments
Bastian Jungnitsch, Sönke Niekamp, Matthias Kleinmann +6
Entanglement is often verified by a violation of an inequality like a Bell inequality or an entanglement witness. Considerable effort has been devoted to the optimization of such i…
The XXZ model with anti-periodic twisted boundary conditions
Sönke Niekamp, Tobias Wirth, Holger Frahm
We derive functional equations for the eigenvalues of the XXZ model subject to anti-diagonal twisted boundary conditions by means of fusion of transfer matrices and by Sklyanin's m…