Operational discord measure for Gaussian states with Gaussian measurements

Rahimi-Keshari, Saleh, Ralph, Timothy C. and Caves, Carlton M. (2015) Operational discord measure for Gaussian states with Gaussian measurements. New Journal of Physics, 17 6: 1-12. doi:10.1088/1367-2630/17/6/063037

Author Rahimi-Keshari, Saleh
Ralph, Timothy C.
Caves, Carlton M.
Title Operational discord measure for Gaussian states with Gaussian measurements
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2015-06
Year available 2015
Sub-type Article (original research)
DOI 10.1088/1367-2630/17/6/063037
Open Access Status DOI
Volume 17
Issue 6
Start page 1
End page 12
Total pages 12
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2016
Language eng
Abstract We introduce an operational discord-type measure for quantifying nonclassical correlations in bipartite Gaussian states based on using Gaussian measurements. We refer to this measure as operational Gaussian discord (OGD). It is defined as the difference between the entropies of two conditional probability distributions associated to one subsystem, which are obtained by performing optimal local and joint Gaussian measurements. We demonstrate the operational significance of this measure in terms of a Gaussian quantum protocol for extracting maximal information about an encoded classical signal. As examples, we calculate OGD for several Gaussian states in the standard form.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
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