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SUMMARY:Reliability of classical and classical-quantum channels - Dalai\, 
 M (Universit degli Studi di Brescia)
DTSTART:20131018T130000Z
DTEND:20131018T140000Z
UID:TALK48458@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The performance of a channel is usually measured in terms of i
 ts capacity C\, intended as the largest rate achievable by block codes wit
 h probability of error which vanishes in the block-length. For rates R<C\,
  the probability of error for optimal codes decreases exponentially fast w
 ith the block-length\, and a more detailed measure of the performance of t
 he channel is the so called reliability function E(R)\, the first order ex
 ponent of this error.Determining E(R) exactly is an unsolved problem in ge
 neral\; it includes as a sub-problem\, for example\, the determination of 
 the zero-error capacity (also called Shannon capacity of a graph). In this
  talk\, we discuss bounds to E(R) for classical and classical-quantum chan
 nels and presents some connections between those bounds and the Lovasz the
 ta function.\n
LOCATION:Seminar Room 1\, Newton Institute
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