Violation of Bell's Inequality Using Continuous Variable Measurements

Oliver Thearle, Jiri Janousek, Seiji Armstrong, Sara Hosseini, Melanie Schünemann, Syed Assad, Thomas Symul, Matthew R. James, Elanor Huntington, Timothy C. Ralph, Ping Koy Lam

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    24 Citations (Scopus)

    Abstract

    A Bell inequality is a fundamental test to rule out local hidden variable model descriptions of correlations between two physically separated systems. There have been a number of experiments in which a Bell inequality has been violated using discrete-variable systems. We demonstrate a violation of Bell's inequality using continuous variable quadrature measurements. By creating a four-mode entangled state with homodyne detection, we recorded a clear violation with a Bell value of B=2.31±0.02. This opens new possibilities for using continuous variable states for device independent quantum protocols.

    Original languageEnglish
    Article number040406
    JournalPhysical Review Letters
    Volume120
    Issue number4
    DOIs
    Publication statusPublished - 25 Jan 2018

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