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International Workshop on Quantum Information Processing
 
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QIP 2010 at

ETH Life

The daily web-journal of ETH Zurich:

"Lifting the big veil"

"Nach dem grossen Schleier lüften"

18.01.2010

QIP 2010 at the

Swiss Radio DRS

Echo der Zeit

from Monday Jan 18, 2010

in German, Link >>

(Real Player recommended)

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pdf files of
Programme Booklet >>
and
Abstracts of all Talks >>

You will receive a hard copy of these files at the registration desk.

Sponsors

Pauli Center for Theoretical Studies

pauliohne


The Swiss National Science Foundation

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ETH Zurich (Computer Science and Physics Department)

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Quantum Science and Technology

qsitmitschrift


CQT Singapore

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QAP European Project

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Sandia National Laboratories

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Institute for Quantum Computing

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id Quantique

3rdideequantique

Regularization and its discontents

Graeme Smith, IBM, Watson


The cornerstone of information theory is Shannon’s theorem, which shows that the capacity of a channel for noiseless communication is given by a simple optimization problem: it is the maximum mutual information that can be generated between input and output with a single use of the channel.  In the quantum setting, such “single-letter” formulas are few and far between.  The best expressions we have for quantum capacities involve optimizations of entropic quantities over an asymptotically large number of channel uses.  Such “regularized” formulas tell us very little.   The purpose of this talk is to give an overview of what we know about this need for regularization, when and why it happens, and what it means.  I will focus on the quantum capacity of a quantum channel, which is the case we understand best.

 

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