# Heidelberg 2015 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 35: Quantum Information: Concepts and Methods V

### Q 35.3: Vortrag

### Mittwoch, 25. März 2015, 11:30–11:45, K/HS1

**Detecting the Range of Entanglement** — •Sabine Wölk and Otfried Gühne — University of Siegen, Siegen, Germany

Entanglement is an important resource for quantum information. Investigation tools to investigate and certify entanglement are necessary to profit from entanglement. However, the evolution of quantum systems does not only depend on the amount of entanglement but also on how many particles are entangled and how far apart the entangled particles are. Especially for systems where addressing of single particles is not possible, investigation tools are missing.

In this talk we will introduce methods to investigate the range of entanglement with the help of global operators such as the Hamilton operator and the total spin. We will concentrate on the investigation of spin-chains described by the Heisenberg model with only nearest-neighbor coupling as well as next-nearest neighbor coupling. Such models are important to understand and explain magnetic phenomena in solid states such as phase transitions and spontaneous magnetization.