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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

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The Swiss National Science Foundation

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ETH Zurich (Computer Science and Physics Department)

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Quantum Science and Technology

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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

Span programs and quantum algorithms

Ben Reichardt, University of Waterloo

We show that the general adversary lower bound on quantum query complexity is nearly tight, by giving a matching quantum walk algorithm. The result gives a new semi-definite program for quantum query complexity, and shows an equivalence to the span program model of computation. Span programs compose easily, and this yields a quantum recursion method. Classical algorithms cannot compose in this way. Applying the technique to solve problems defined recursively with independent inputs, i.e., to evaluating formulas, gives an optimal quantum formula-evaluation algorithm. Span programs are a promising model for developing more quantum algorithms.

 

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