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SUMMARY:In support of ontic view of quantum states - Berry Groisman (CQC C
 ambridge)
DTSTART:20090312T141500Z
DTEND:20090312T151500Z
UID:TALK17259@talks.cam.ac.uk
CONTACT:Lawrence Ioannou
DESCRIPTION:One of the foundational corner-stones of quantum theory is the
  question of the ontological reality of quantum states. This question is d
 eeply related to the problem of quantum-classical transition. If one does 
 not accept the ontological reality of quantum states\, but does regard cla
 ssical states as states of reality then she must give some account of this
  change in description associated with quantum-classical transition.\n\n \
 n\nIn the framework of quantum information theory it is common to demarcat
 e the border-line between classical and quantum phenomena using characteri
 stic features of quantum processes\, e.g. non-locality\, entanglement\, no
 -cloning\, non-commutativity\, uncertainty relation. It is known that quan
 tum features listed above are not equivalent\, e.g. entanglement does not 
 imply non-locality. Therefore\, they cannot lead to unambiguous quantum-cl
 assical distinction. Lucien Hardy addressed the problem from the perspecti
 ve of a relation between no-cloning and non-locality. To this end Hardy in
 troduces a local toy model theory where cloning is not possible\, thereby 
 concluding that no-cloning is logically independent of non-locality. Altho
 ugh Hardy’s model is non-quantum it is not classical either and has many
  analogies with quantum theory. Rob Spekkens constructs his toy models to 
 argue against the ontic view of quantum states. His argument builds upon t
 he analogies between those models and quantum theory\, and on the observat
 ion that corresponding states in the toy models do not have ontic interpre
 tation. \n\n \n\nI defend the ontic view of quantum states by scrutinizing
  the essential differences between quantum theory and the toy model theori
 es.\n\n \n\n
LOCATION:MR11\, Centre for Mathematical Sciences
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