Collective detection of multipartite entanglement

• Applicant: Dr. Hermann Kampermann
• Subject Area: Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
• Term: from 2010 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 185183262

Entanglement is one of the key features in many quantum information protocols and it plays an important role in critical many-body systems. We will investigate the usage of global diffractive properties, explicitly the static structure factors, for detecting (multipartite) entanglement. It is planned to construct classes of entanglement witnesses from structure factors to detect a large variety of quantum states and different types of multipartite entanglement. These witnesses will depend on the particle number. We want to verify entanglement in systems with a large number of particles, where the limit of infinitely large (macroscopic) systems will be of special interest. The influence of noise on the detection capabilities will be explored to estimate these effects in experiments. In addition to the above theoretical investigations we plan to implement these concepts in experiments. The aim is the detection of multipartite entanglement (via structure factors) in ion trap experiments and to detect for the first time true entanglement (as opposed to pseudo entanglement) in large highly mixed NMR qubit Systems.

• DFG Programme: Research Grants
• Participating Person: Professorin Dr. Dagmar Bruß