Detection of Bell Correlations in a Bose-Einstein Condensate

Detection of Bell Correlations in a Bose-Einstein Condensate
Date & Time: 
Monday, August 1, 2016 -
14:30 to 15:30
Matteo Fadel, University of Basel
Room 264, Geography Building, ECNU | 3663 Zhongshan Road North, Shanghai
Measurements performed by different observers can show correlations stronger than any local deterministic theory allows. These Bell correlations are confirmed by violating a Bell inequality. I will present the results of our recent work[1], where we show experimentally that Bell correlations can be detected in a spin-squeezed Bose-Einstein condensate of about 480 Rubidium-87 atoms. Our result relies on a Bell correlation witness, derived from a multi-partite Bell inequality[2], that is violated by almost four standard deviations. This proves that Bell correlations are present in moderately entangled and experimentally accessible many-body systems, and that individually addressing or detecting the particles is not necessary.
  1. R. Schmied, J.-D. Bancal, B. Allard, M. Fadel, V. Scarani, P. Treutlein, N. Sangouard, Science 352, 441 (2016)
  2. J. Tura, R. Augusiak, A.B. Sainz, T. Vértesi, M. Lewenstein, A. Acin, Science 344, 1256 (2014)
Matteo Fadel is currently a Ph.D. student in the quantum atom optics lab of Professor Philipp Treutlein, University of Basel. He received M.Sc. in Physics from ETH Zurich, Switzerland.
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