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 M., Helen M. Chrzanowski, Jiri Janousek, Thomas Symul, Timothy C. Ralph, Ping Koy Lam, Mile Gu, Kavan Modi, Vlatko Vedral

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationConference on Lasers and Electro-Optics (CLEO 2014)
Subtitle of host publication8-­13 June 2014, San Jose, California, USA
Place of PublicationPiscataway NJ USA
PublisherOptical Society of America (OSA)
Number of pages2
ISBN (Print)9781557529992
Publication statusPublished - 2014
Externally publishedYes
EventConference on Lasers and Electro-Optics 2014 - San Jose McEnery Convention Center, San Jose, United States of America
Duration: 8 Jun 201413 Jun 2014
https://ieeexplore.ieee.org/xpl/conhome/6971875/proceeding (Proceedings)

Publication series



ConferenceConference on Lasers and Electro-Optics 2014
Abbreviated titleCLEO 2014
Country/TerritoryUnited States of America
CitySan Jose
Internet address


  • Correlation
  • Discord QD
  • Quantum optics

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