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SUMMARY:Hidden variables\, hidden states and hidden nonlocality: the in-eq
 uivalence of entanglement and nonlocality  - Joseph Bowles\, University of
  Geneva
DTSTART:20160303T141500Z
DTEND:20160303T151500Z
UID:TALK64112@talks.cam.ac.uk
CONTACT:Steve Brierley
DESCRIPTION:Entangled quantum systems are known to give rise to non-classi
 cal phenomena\, the most shocking of which is arguably quantum nonlocality
 \, as witnessed by Bell inequality violation. Whereas nonlocal correlation
 s imply the existence of entanglement\, the converse question is not so ea
 sy: do all entangled states lead to nonlocality? In the simplest possible 
 scenario the answer has for a long time known to be no: there exist certai
 n entangled states that admit a so called local hidden variable model and 
 thus do not violate any Bell inequality. \n\nHere\, I use tools from the a
 rea of quantum steering in order to extend this in-equivalence to more com
 plex scenarios. I will present the first examples of genuinely multipartit
 e entangled states admitting local hidden variable models and the first ex
 ample of an entangled quantum state that does not violate any Bell inequal
 ity\, even if one allows for stochastic local pre-processing. Finally\, I 
 will present some open problems.\n
LOCATION:MR4\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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