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SUMMARY:Information causality - Marcin Pawlowski (University of Bristol)
DTSTART:20101125T141500Z
DTEND:20101125T151500Z
UID:TALK26332@talks.cam.ac.uk
CONTACT:Ashley Montanaro
DESCRIPTION:Information causality is a physical principle which states tha
 t it is the sender\, not the receiver\, who decides what the message is ab
 out. After being expressed more formally it can be shown to hold in both c
 lassical and quantum information theory. However\, if quantum mechanics we
 re even a little more non-local this principle would be violated.  The mai
 n aim of finding operational principles like information causality that li
 mit the nonlocal correlations allowed by probabilistic theories is that th
 ey help to explain  the phenomenon of non-locality without referring to th
 e mathematical structure of any particular theory. This is the first step 
 to deriving quantum mechanics from principles which are not just about Hil
 bert space but are meaningful. Furthermore\, operational principles are qu
 ite useful for more practical task of bounding the performance of various 
 information processing protocols.\nIn this talk I introduce information ca
 usality and show how it can be derived from the properties of mutual infor
 mation. I also give reasons why one does not have to derive it and can sim
 ply assume it. Then I describe the consequences of this principle for acce
 ptable probability distributions.\n
LOCATION:MR4\, Centre for Mathematical Sciences
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