Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 67: Quantum information: Concepts and methods V

Q 67.1: Vortrag

Freitag, 22. März 2013, 14:00–14:15, E 214

External vs internal spin squeezing. How to tell them apart? — Giuseppe Vitagliano¹, •Zoltan Zimboras¹, Philipp Hyllus¹, Inigo Egusquiza¹, and Geza Toth^1,2,3 — ¹Theoretical Physics, University of the Basque Country UPV/EHU, E-48080 Bilbao, Spain — ²IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain — ³Wigner Research Centre for Physics, H-1525 Budapest, Hungary

Spin squeezing with collective angular momentum operators is studied for an ensemble of atoms with a local spin larger than 1/2. In these systems, unlike the case of spin-1/2 ensembles, it is possible to carry out internal spin squeezing: only the local spin of each atom is squeezed, while there is no correlation between the atoms. We discuss the possibility of introducing entanglement conditions that can identify whether the ensemble of atoms is in such an internal squeezed state or there is genuine inter-particle spin squeezing, which we term external squeezing. Also the detection of internal and external squeezing with possible collective measurements in actual experiments is addressed.