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Conferences > CLEO_QELS > 2014 > FTh3A > FTh3A.6

Experimental verification of quantum discord in continuous-variable states and operational significance of discord consumption

Sara Hosseini, Saleh Rahimi-Keshari, Jing Yan Haw, Syed M Assad, Helen M Chrzanowski, Jiri Janousek, Thomas Symul, Timothy C Ralph, Ping Koy Lam, Mile Gu, Kavan Modi, and Vlatko Vedral

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Abstract

We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and 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 quantum discord. We also demonstrate that under certain measurement constraints, discord between bipartite systems can be consumed to encode information that can only be accessed by coherent quantum interaction.

© 2014 Optical Society of America

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