Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quanteninformation (Konzepte und Methoden I)
Q 31.6: Talk
Thursday, March 13, 2008, 09:45–10:00, 1B
Bound Entanglement and Entanglement Bounds — •Simeon Sauer1,2, Fernando de Melo2,3, Joonwoo Bae4, Florian Mintert2,3, Beatrix Hiesmayr5, and Andreas Buchleitner2,3 — 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.