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SUMMARY:Bell correlations in a Bose-Einstein condensate - Philipp Treutlin
  (Unibas Switzerland)
DTSTART:20160118T153000Z
DTEND:20160118T170000Z
UID:TALK63223@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:The parts of a composite system can share correlations that ar
 e stronger than any classical theory allows. These so-called Bell correlat
 ions can be confirmed by violating a Bell inequality and represent the mos
 t profound departure of quantum from classical physics. I will report on e
 xperiments where we detect Bell correlations between the spins of 480 atom
 s in a Bose-Einstein condensate. We derive a Bell correlation witness from
  a recent many-particle Bell inequality involving one- and two-body correl
 ation functions only. Our measurement on a spin-squeezed state exceeds the
  threshold for Bell correlations by 3.8 standard deviations. Concluding th
 e presence of Bell correlations is unprecedented for an ensemble containin
 g more than a few particles. Our work shows that the strongest possible no
 n-classical correlations are experimentally accessible in many-body system
 s\, and that they can be revealed by collective measurements. This opens n
 ew perspectives for using many-body systems in quantum information tasks
LOCATION:Ryle Seminar (Rutherford 930)
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