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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

Quantum coin flipping

André Chailloux, Université de Paris-Sud

joint work with Iordanis Kerenidis

Coin flipping is a fundamental cryptographic primitive that enables two distrustful and far apart parties to create a uniformly random bit. Quantum information allows for protocols in the information theoretic setting where no dishonest party can perfectly cheat. The previously best-known quantum protocol by Ambainis achieved a cheating probability of at most 3/4. On the other hand, Kitaev showed that no quantum protocol can have cheating probability less than 1/sqrt(2). Closing this gap has been one of the important open questions in quantum cryptography.

In this talk, we will present a quantum strong coin flipping protocol with cheating probability arbitrarily close to 1/sqrt(2). More precisely, we will show how to use any weak coin flipping protocol with cheating probability 1/2 + ε in order to achieve a strong coin flipping protocol with cheating probability 1/sqrt(2) + O(ε). The optimal quantum strong coin flipping protocol follows from our construction and the optimal quantum weak coin flipping protocol described by Mochon. In the second part of the talk, we will describe Kitaev's formalism for coin flipping and how it was used by Mochon for the construction of the optimal weak coin flipping protocol.



 

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