Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Information: Concepts and Methods 3
Q 20.5: Talk
Tuesday, March 15, 2011, 11:30–11:45, SCH A118
Entanglement detection in systems of spin-j particles with collective observables — •Giuseppe Vitagliano1 and Géza Tóth1,2,3 — 1Theoretical Physics, The University of the Basque Country, E-48080 Bilbao, Spain — 2IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain — 3Research Institute for Solid State Physics and Optics, H-1525 Budapest, Hungary
We discuss the problem of finding inequalities useful to detect entanglement in systems of particles with a spin higher than 1/2. We focus on uncertainty relations based on the knowledge of the first two moments of global observables, such as for example the total spin components. We compare the various inequalities obtained from the point of view of their usefulness to detect entanglement by characterizing the experimental effort needed and by studying the states that violate them.