Frontiers of quantum physics

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The thermodynamic meaning of negative entropy (vol 474, pg 61, 2011)

NATURE 476:7361 (2011) 476-476

Authors:

Lidia del Rio, Johan Aberg, Renato Renner, Oscar Dahlsten, Vlatko Vedral
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Topological order in 1D Cluster state protected by symmetry

Quantum Information Processing (2011) 1-8

Authors:

W Son, L Amico, V Vedral

Quantum physics: Hot entanglement.

Nature 468:7325 (2010) 769-770
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Quantum Aspects of Life

American Journal of Physics American Association of Physics Teachers (AAPT) 78:12 (2010) 1435-1436
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Necessary and sufficient condition for nonzero quantum discord.

Phys Rev Lett 105:19 (2010) 190502

Authors:

Borivoje Dakić, Vlatko Vedral, Caslav Brukner

Abstract:

Quantum discord characterizes "nonclassicality" of correlations in quantum mechanics. It has been proposed as the key resource present in certain quantum communication tasks and quantum computational models without containing much entanglement. We obtain a necessary and sufficient condition for the existence of nonzero quantum discord for any dimensional bipartite states. This condition is easily experimentally implementable. Based on this, we propose a geometrical way of quantifying quantum discord. For two qubits this results in a closed form of expression for discord. We apply our results to the model of deterministic quantum computation with one qubit, showing that quantum discord is unlikely to be the reason behind its speedup.
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