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Q: Fachverband Quantenoptik und Photonik

Q 13: Quantum information: Concepts and methods I

Q 13.5: Talk

Monday, March 18, 2013, 15:00–15:15, E 214

Quantitative two-qutrit entanglement — Christopher Eltschka¹ and •Jens Siewert^2,3 — ¹Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany — ²Departamento de Química Física, Universidad del País Vasco UPV/EHU, 48080 Bilbao, Spain — ³IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain

We introduce the new concept of axisymmetric bipartite states. For d× d-dimensional systems these states form a two-parameter family of nontrivial mixed states that include the isotropic states. We present exact quantitative results for class-specific entanglement as well as for the negativity and I-concurrence of two-qutrit axisymmetric states. These results have interesting applications such as for quantitative witnesses [1] of class-specific entanglement in arbitrary two-qutrit states and as device-independent witness for the number of entangled dimensions.

[1] C. Eltschka and J. Siewert, Sci. Rep. 2, 942 (2012).