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SUMMARY:Symmetry\, symmetry\, symmetry! - Matthias Christandl
DTSTART:20110325T120000Z
DTEND:20110325T130000Z
UID:TALK30288@talks.cam.ac.uk
CONTACT:Sergii Strelchuk
DESCRIPTION:In different situations in quantum information theory one woul
 d 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 eavesdroppe
 r carries out a 'collective attack' rather than more general attacks. But 
 this also appears at other places like mean field theory\, quantum tomogra
 phy\, quantum games\, channel coding. Quantum versions of de Finetti's the
 orem have done a nice job in tackling these problems\, but are often rathe
 r cumbersome to use and do not yield optimal parameters. In this talk\, I 
 will explain a different technique that is both easy to use and has a bett
 er performance and hope to convince you to use it in your next problem! Th
 e talk is based on two papers: http://arxiv.org/abs/0809.3019\nhttp://arxi
 v.org/abs/0912.3805
LOCATION:MR14\, Centre for Mathematical Sciences
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