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SUMMARY:The Princess and the EPR pair - Aram Harrow (University of Bristol
 )
DTSTART:20100603T131500Z
DTEND:20100603T141500Z
UID:TALK24021@talks.cam.ac.uk
CONTACT:Jonathan
DESCRIPTION:In quantum information\, entanglement has often been viewed as
  a resource.  But in this talk\, I will look at (pure bipartite) entanglem
 ent through the lens of superselection rules.  The idea is that it require
 s quantum communication not only to create entanglement\, but also to dest
 roy it in a way that doesn't leak information to the environment.  As a re
 sult\, when communication is scarce\, superpositions of different numbers 
 of EPR pairs can be difficult to obtain.  This constraint is not a strict 
 superselection rule\, but rather an approximate version that gives rigorou
 s bounds on achievable fidelities.  After describing the general phenomeno
 n\, I will show how it relates to communication complexity\, information t
 heory and fairy tales about princesses.\n\nThis talk is based on 0803.3066
 \, 0909.1557\, 0912.5537 and other unpublished work.
LOCATION:MR2\, Centre for Mathematical Sciences
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