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CATEGORIES:CQIF Blackboard Talk
SUMMARY:Symmetry\, symmetry\, symmetry! - Matthias Christa
ndl
DTSTART;TZID=Europe/London:20110325T120000
DTEND;TZID=Europe/London:20110325T130000
UID:TALK30288AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/30288
DESCRIPTION:In different situations in quantum information the
ory one would like to argue that the state of the
system is of tensor product form. A famous example
is QKD\, where we would like to assume that the e
avesdropper carries out a 'collective attack' rath
er than more general attacks. But this also appear
s at other places like mean field theory\, quantum
tomography\, quantum games\, channel coding. Quan
tum versions of de Finetti's theorem have done a n
ice job in tackling these problems\, but are often
rather cumbersome to use and do not yield optimal
parameters. In this talk\, I will explain a diffe
rent technique that is both easy to use and has a
better performance and hope to convince you to use
it in your next problem! The talk is based on two
papers: http://arxiv.org/abs/0809.3019\nhttp://ar
xiv.org/abs/0912.3805
LOCATION:MR14\, Centre for Mathematical Sciences
CONTACT:Sergii Strelchuk
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