Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 37: Quantum Information: Concepts and Methods VI
Q 37.6: Vortrag
Mittwoch, 2. März 2016, 15:45–16:00, e214
Quantifying entanglement of two-qutrit states with positive partial transpose — Christopher Eltschka1, •Gaél Sentís2, and Jens Siewert2,3 — 1University of Regensburg, Regensburg, Germany — 2University of the Basque Country UPV/EHU, Bilbao, Spain — 3Ikerbasque, Basque Foundation for Science
A bipartite system with local dimensions d 3 may be in an entangled state albeit its partially transposed density matrix has only nonnegative eigenvalues. Such PPT-entangled states constitute a subject of continued interest in quantum information since, e.g., no singlet entanglement can be distilled from them. As PPT-entangled states in general are highly mixed the quantification of their entanglement in terms of established entanglement measures has remained an open question. In this contribution we present a family of highly symmetric two-qutrit states which contains regions with PPT entanglement. We discuss the possibility of exact quantification of the entanglement by using concurrence-based entanglement monotones.