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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Information: Concepts and Methods 3

Q 20.5: Vortrag

Dienstag, 15. März 2011, 11:30–11:45, SCH A118

Entanglement detection in systems of spin-j particles with collective observables — •Giuseppe Vitagliano¹ and Géza Tóth^1,2,3 — 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.