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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

Stability of topological quantum memories in contact with a thermal bath

Stefano Chesi, Basel

joint work with Beat Röthlisberger, Daniel Loss, Sergey Bravyi, and Barbara M. Terhal


We discuss several aspects related to the thermal stability of quantum memories. These are typically represented by spin lattice Hamiltonians encoding one or several qubits in a degenerate eigenspace. A self-correcting quantum memory has an infinite lifetime in the thermodynamic limit, even if the individual spins of the lattice are short-lived. While several candidate quantum memories were proposed to be self-correcting, many have revealed inadequate or difficult to analyze. In our work: a) We discuss general criteria to establish the stability of a quantum memory and derive a rigorous upper bound to the relaxation rate of a general quantum memory and b) We examine a generalization of the two-dimensional toric code which includes long-range repulsive interactions. By analytical arguments and direct numerical simulations we establish that such long-range interactions lead to stable memories. The lifetime scales polynomially with system size and the exponent is large for a super-ohmic thermal environment. We also show that such long-range interactions are physically relevant.

 

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