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SUMMARY:Multi-partite subspaces containing no non-local information - Sara
 h Croke (University of Glasgow)
DTSTART:20190502T131500Z
DTEND:20190502T141500Z
UID:TALK123286@talks.cam.ac.uk
CONTACT:Adrian Kent
DESCRIPTION:One notion of non-locality in quantum theory is the fact that 
 information may be encoded in a composite system in such a way that it is 
 not accessible through local measurements\, even with the assistance of cl
 assical communication. Thus\, contrary to the classical case\, there exist
 s information in quantum many body systems which cannot be accessed locall
 y. Perhaps surprisingly\, this sense of non-locality is distinct to a more
  famous manifestation of quantum non-locality\, namely entanglement: there
  exist sets of states with no entanglement\, which contain information tha
 t cannot be accessed locally\, and vice-versa. In addition to theoretical 
 interest\, measurement non-locality is of practical relevance\, as local m
 easurements are readily performed in the lab in a range of physical system
 s. In this talk I will introduce measurement non-locality and show that\, 
 remarkably\, if information is confined to any two-dimensional subspace of
  a multi-partite system\, all physically allowed measurements can be perfo
 rmed locally: there is no truly non-local information in a single encoded 
 qubit.\n\n
LOCATION:MR21\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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