Bonn 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
QI: Fachverband Quanteninformation
QI 33: Quantum Materials and Many-Body Systems
QI 33.5: Vortrag
Donnerstag, 13. März 2025, 15:30–15:45, HS VIII
Threetangle in the XY-model class with a non-integrable field background — •Andreas Osterloh1 and Jörg Neveling2 — 1TII Abu Dhabi, UAE — 2Software Engineering, Konecranes GmbH, Düsseldorf, Germany.
The square root of the threetangle is calculated for the transverse XY-model with an integrability-breaking in-plane field component. To be in a regime of quasi-solvability of the convex roof, here we concentrate here on a 4-site model Hamiltonian. In general, the field and hence a mixing of the odd/even sectors, has a detrimental effect on the threetangle, as expected. Only in a particular spot of models with no or weak inhomogeneity γ does a finite value of the tangle prevail in a broad maximum region of the field strength h≈ 0.3± 0.1. There, the threetangle is basically independent of the non-zero angle α. This system could be experimentally used as a quasi-pure source of threetangled states or as an entanglement triggered switch depending on the experimental error in the field orientation.
Keywords: Multipartite entanglement; convex roof; spin model