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SUMMARY:If quantum mechanics were more non-local it would violate the unce
 rtainty principle - Jonathan Oppenheim (DAMTP)
DTSTART:20100506T131500Z
DTEND:20100506T141500Z
UID:TALK24587@talks.cam.ac.uk
CONTACT:Jonathan
DESCRIPTION:The two defining elements of quantum mechanics are Heisenberg'
 s uncertainty principle\, and a subtle form of non-locality which Einstein
  famously called "spooky action at a distance". The first principle states
  that there are measurements whose results cannot be simultaneously predic
 ted with certainty. The second that when performing measurements on two or
  more separated systems the outcomes can be correlated in a way that defie
 s the classical world. These two fundamental features have thus far been s
 eparate and distinct concepts. Here we show that they are inextricably and
  quantitatively linked. Quantum mechanics cannot be more non-local without
  violating the uncertainty principle. In fact\, the link between uncertain
 ty and non-locality holds for all physical theories. More specifically\, t
 he degree of non-locality of any theory is solely determined by two factor
 s -- one being the strength of the uncertainty principle\, and the second 
 one being the strength of a property which Schrodinger called "steering". 
 The latter determines which states can be prepared at one location given a
  measurement at another\, and in most theories of nature this is determine
 d by causality alone. 
LOCATION:MR2\, Centre for Mathematical Sciences
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