A Bell inequality is a fundamental test to rule out local hidden variablemodel descriptions of correlations between two physically separated systems.There have been a number of experiments in which a Bell inequality has beenviolated using discrete-variable systems. We demonstrate a violation of Bellsinequality using continuous variable quadrature measurements. By creating afour-mode entangled state with homodyne detection, we recorded a clearviolation with a Bell value of $B = 2.31 \pm 0.02$. This opens newpossibilities for using continuous variable states for device independentquantum protocols.
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机译：贝尔不等式是排除两个物理分离的系统之间相关性的局部隐藏变量模型描述的基本检验。已有许多实验使用离散变量系统消除了贝尔不等式。我们证明了使用连续变量正交测量违反了Bellsinequality。通过用零差检测创建四模式纠缠态，我们记录了贝尔值为$ B = 2.31 \ pm 0.02 $的清晰偏差。这为将连续可变状态用于独立于设备的量子协议开辟了新的可能性。
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