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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

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Measurements incompatible in quantum theory cannot be measured jointly in any other no-signaling theory

Michael Wolf, NBI Copenhagen

joint work with David Perez-Garcia, and Carlos Fernandez

"While [...] the wave function does not provide a complete description of physical reality, we left open the question of whether or not such a description exists. We believe, however, that such a theory is possible.'' Einstein, Podolsky and Rosen, 1935.

More than seventy years after Einstein, Podolsky and Rosen (EPR) raised this puzzle we know, as a consequence of Bell's argument, that a complete theory in the sense of EPR would force us to pay a high price--- such as giving up Einstein locality. Could there, however, be a theory which provides more information than quantum mechanics but still is `incomplete enough' to circumvent such fundamental conflicts? In this work we address a particular instance of this question, in the context of which the answer is clearly negative: observables which are not jointly measurable within quantum mechanics must remain incompatible in every hypothetical refinement of this theory unless one gives up Einstein locality.

More technically speaking we show that the maximal Bell violation is the Lagrangiang dual of the joint measurability problem.

 

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