Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Quantum information: Concepts and methods I
Q 13.3: Talk
Monday, March 18, 2013, 14:30–14:45, E 214
Non-linear genuine multiparty entanglement witness and its application to graph states — •Junyi Wu1, Hermann Kampermann1, Dagmar Bruß1, Claude Klockl2, and Marcus Huber3 — 1Institute for Theoretical Physics III, Heinrich-Heine-University Dusseldorf, D-40225 Dusseldorf, Germany — 2University of Vienna, Faculty of Mathematics, Nordbergstrae 15, 1090 Wien, Austria — 3University of Bristol, Department of Mathematics, Bristol, BS8 1TW, U.K.
In [1] we introduced a general non-linear witness by lower bounding a genuine multipartite entanglement (GME) measure. The witness is experimentally efficient to implement since only a few off-diagonal and diagonal density operator elements are needed. However, its detection capabilities are basis dependent. Because it is not straightforward to construct an optimal non-linear GME-witness for a given target state, we develop techniques to construct an optimal non-linear GME-witness, and investigate its application to graph states with noise.
[1] Jun-Yi Wu, Hermann Kampermann, Dagmar Bruß, Claude Klockl, and Marcus Huber. Phys. Rev. A, 86:022319, Aug 2012.