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UID:953@lincs.fr
DTSTART;TZID=Europe/Paris:20260618T151500
DTEND;TZID=Europe/Paris:20260618T161500
DTSTAMP:20260615T124950Z
URL:https://www.lincs.fr/events/beyond-the-hashing-bound-coding-for-quantu
 m-pauli-channels/
SUMMARY:Beyond the Hashing Bound: Coding for Quantum Pauli Channels
DESCRIPTION:Classical channel coding benefited from a remarkably clear
 target: Shannon’s capacity formula. Quantum channel coding is less
 settled. Even for memoryless Pauli channels\, the quantum capacity is not
 known in general\, and the hashing bound can be far below the best known
 upper bounds.\n \nIn this talk I will discuss how one principled method
 of how one can obtain achievable rates beyond the hashing bound. I will
 start from the basic Gottesman standard form for stabilizer codes and use
 it to give a coding-theoretic view of the obstruction. The main idea is to
 exploit degeneracy and channel transforms so that the effective uncertainty
 seen by the decoder is reduced. This leads naturally to constructions
 involving familiar objects from classical coding theory\, including binary
 symmetric channels and LDGM-type matrices.\n \nThe goal is not only to
 improve numerical lower bounds\, but also to better understand what
 capacity-achieving constructions for quantum channels might have to look
 like. No prior background in quantum information will be
 assumed.\n \nBio: Ruediger L. Urbanke is a professor in the School of
 Computer and Communication Sciences at EPFL\, where he is a member of the
 Information Processing Group. He received the Dipl.-Ing. degree from the
 Vienna University of Technology in 1990\, and the M.Sc. and Ph.D. degrees
 in Electrical Engineering from Washington University in St. Louis in 1992
 and 1995\, respectively. From 1995 to 1999 he was a member of the
 Mathematics of Communications Department at Bell Labs\, before joining
 EPFL. He served as Dean of the School of Computer and Communication
 Sciences from 2021 to 2025 and was President of the IEEE Information Theory
 Society in 2017. He is co-author\, with Tom Richardson\, of Modern Coding
 Theory published by Cambridge University Press. His research interests
 include coding and information theory\, error-correcting codes for
 classical and quantum communication\, and the theoretical foundations of
 modern machine learning.\n
CATEGORIES:Seminars
LOCATION:Amphi 3\, 19 Place Marguerite Perey\, Palaiseau\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=19 Place Marguerite Perey\,
 Palaiseau\, France;X-APPLE-RADIUS=100;X-TITLE=Amphi 3:geo:0,0
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TZID:Europe/Paris
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DTSTART:20260329T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
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