Title: Quantitative two-qutrit entanglement

Speaker: Prof. Jens Siewert, Dpto. de Química-Física Facultad de Ciencia y Tecnología Universidad del País Vasco, UPV IEHU Apdo. 644, 48080 Bilbao, Spain

Time and place: 13:30-14:30 [1:30-2:30p, Dec. 6, 2012, Room 111, Physics Building

Abstract:

Quantification of entanglement in arbitrary quantum states is an unsolved problem. Recently, a new symmetry for multipartite qubit states has been found, the so-called GHZ symmetry. For the family of GHZ-symmetric states many interesting questions regarding the entanglement properties can be answered exactly.

In this talk, we extend the idea of GHZ symmetry to higher-dimensional bipartite systems and term it 'axisymmetry'. In particular we study axisymmetric states of two qutrits. We calculate class-specific entanglement measures exactly. By using these results it is possible to quantitatively estimate those entanglement measures also for arbitrary two-qutrit states.

Biography:

Prof. Jens Siewert obtained a PhD from the University of Karlsruhe (Germany) in the group of Gerd Schoen in 1996. After postdoctoral appointments at the Massachusetts Institute of Technology (Cambridge, US), at the University of Catania (Italy) and at the University of Regensburg (Germany) he became a Heisenberg Fellow of the German Research Foundation in 2004. In 2009, he moved to the University of the Basque Country in Bilbao where he currently holds a position as an Ikerbasque Research Professor. His work covers subjects ranging from solid-state physics to quantum information theory and geophysics which he published in more than 50 research papers in refereed journals, among them Nature and Physical Review Letters.