Experimental verification of quantum discord in continuous-variable states

Hosseini, S., Rahimi-Keshari, S., Haw, J. Y., Assad, S. M., Chrzanowski, H. M., Janousek, J., Symul, T., Ralph, T. C. and Lam, P. K. (2014) Experimental verification of quantum discord in continuous-variable states. Journal of Physics B: Atomic, Molecular and Optical Physics, 47 2: . doi:10.1088/0953-4075/47/2/025503


Author Hosseini, S.
Rahimi-Keshari, S.
Haw, J. Y.
Assad, S. M.
Chrzanowski, H. M.
Janousek, J.
Symul, T.
Ralph, T. C.
Lam, P. K.
Title Experimental verification of quantum discord in continuous-variable states
Journal name Journal of Physics B: Atomic, Molecular and Optical Physics   Check publisher's open access policy
ISSN 0953-4075
1361-6455
Publication date 2014-01-28
Year available 2014
Sub-type Article (original research)
DOI 10.1088/0953-4075/47/2/025503
Open Access Status
Volume 47
Issue 2
Total pages 8
Place of publication Bristol, United Kingdom
Publisher Institute of Physics
Language eng
Abstract We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and a certain class of non-Gaussian states. We show that any separation in the peaks of the marginal distributions of one subsystem conditioned on two different outcomes of homodyne measurements performed on the other subsystem indicates correlation between the corresponding quadratures, and hence nonzero discord. We also apply this method to non-Gaussian states that are prepared by overlapping a statistical mixture of coherent and vacuum states on a beam splitter. We experimentally demonstrate this technique by verifying nonzero quantum discord in a bipartite Gaussian and certain non-Gaussian states.
Keyword Continuous variable quantum optics
Gaussian states
Quantum discord
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID CE110001027
Institutional Status UQ
Additional Notes Article number 025503.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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