Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Quanteninformation: Konzepte und Methoden 4

Q 31.5: Vortrag

Dienstag, 13. März 2012, 15:00–15:15, V7.01

Spin squeezing and entanglement in systems of spin-j particles — •Giuseppe Vitagliano¹, Philipp Hyllus¹, Iñigo Egusquiza¹, 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 [1]. We focus on uncertainty relations based on the knowledge of the first two moments of the total spin components J_i. 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.

[1] G. Vitagliano, P. Hyllus, I.L. Egusquiza, and G. Tóth, Phys. Rev. Lett. 107, 240502 (2011).