Quantum discord in quantum computation

Aharon Brodutch*, Alexei Gilchrist, Daniel R. Terno, Christopher J. Wood

*Corresponding author for this work

Research output: Contribution to journalConference paper

8 Citations (Scopus)

Abstract

Quantum discord is a measure of the quantumness of correlations. After reviewing its different versions and properties, we apply it to the questions of quantum information processing. First we show that changes in discord in the processed unentangled states indicate the need for entanglement in the distributed implementation of quantum gates. On the other hand, it was shown that zero system-environment discord is a necessary and sufficient condition for applicability of the standard completely positive description of the system's evolution. We demonstrate that this result does not translate into useful quantum process tomography. Depending on the details of the preparation procedure only absence of any initial correlations may guarantees consistency of the process tomography.

Original languageEnglish
Article number012030
Pages (from-to)1-10
Number of pages10
JournalJournal of Physics: Conference Series
Volume306
Issue number1
DOIs
Publication statusPublished - 2011
Event5th International Workshop DICE2010 - Tuscany, Italy, Tuscany
Duration: 13 Sep 201017 Sep 2010

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