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Q: Fachverband Quantenoptik und Photonik

Q 31: Quanteninformation (Konzepte und Methoden I)

Q 31.6: Vortrag

Donnerstag, 13. März 2008, 09:45–10:00, 1B

Bound Entanglement and Entanglement Bounds — •Simeon Sauer^1,2, Fernando de Melo^2,3, Joonwoo Bae⁴, Florian Mintert^2,3, Beatrix Hiesmayr⁵, and Andreas Buchleitner^2,3 — ¹Physikalisch-Astronomische Fakultät, Friedrich-Schiller-Univesität Jena, Germany — ²Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany — ³Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str.38, D-01187 Dresden, Germany — ⁴School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-012, Korea — ⁵Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria

We investigate the separability of Bell-diagonal states of two qutrits. By using lower bounds to algebraically estimate concurrence, we find convex regions of bound entangled states. Some of these regions exactly coincide with the obtained results when employing optimal entanglement witnesses, what shows that the lower bound can serve as a precise detector of entanglement. Some hitherto unknown regions of bound entangled states were discovered with this approach, and delimited efficiently.