Necessary and Sufficient Condition for Nonzero Quantum Discord

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

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.
OriginalspracheEnglisch
Aufsatznummer190502
Seitenumfang8
FachzeitschriftPhysical Review Letters
Jahrgang105
Ausgabenummer19
DOIs
PublikationsstatusVeröffentlicht - 2 Nov. 2010

ÖFOS 2012

  • 103025 Quantenmechanik

Fingerprint

Untersuchen Sie die Forschungsthemen von „Necessary and Sufficient Condition for Nonzero Quantum Discord“. Zusammen bilden sie einen einzigartigen Fingerprint.

Zitationsweisen