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TITLE: Quantum Channel Capacities
SPEAKER: Jon Yard (Los Alamos National Laboratory)
DATE: 2:00 - 3:00 PM, Thursday, May 20, 2010
LOCATION: Tenaya, 3U
ABSTRACT:
Since its introduction over 60 years ago, Shannon's theory of channel
capacity has been extended to networks, to the study of secure
communication, and more recently to channels that are quantum
mechanical in nature. Quantum Shannon theory allows a fundamental
analysis of physical communication channels, enables provably secure
communication based on the laws of physics, and provides a paradigm
for studying the kind of noise that would corrupt future technologies
like quantum computers. In this talk, I will give an overview of
capacity theory for quantum channels, showing that while it shares
certain central features with the classical theory, it also departs
from it in fundamental and interesting ways. For instance, it enables
the analysis of purely quantum correlations embodied by entangled
states, while some channel capacities themselves are now generally
known to be nonadditive. These and other features combine to yield a
rich theory in which several fundamental challenges still remain to be
solved even in the case of point-to-point communication.
BIOGRAPHY:
Jon Yard received his Ph.D. in Electrical Engineering from Stanford
University in 2005 under the supervision of Tom Cover, and has since
held postdoctoral positions at McGill University, Caltech and Los
Alamos National Laboratory. His research interests include quantum
information theory and quantum computation. He was awarded a Feynman
Fellowship at Los Alamos in 2009 and was also a recipient of the 2008
Pat Goldberg Memorial Best Paper Award from IBM Research for his paper
"Quantum communication with zero-capacity channels" (Science '08) with
co-author Graeme Smith.
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