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arXiv 1012.1916quant-ph
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利用粒子和波测量对贝尔不等式的大破坏

Large violation of Bell inequalities using both particle and wave measurements

Daniel Cavalcanti, Nicolas Brunner, Paul Skrzypczyk, Alejo Salles, Valerio Scarani

备注：
v2: 5pages, 3figs, same results
发表信息：
Phys. Rev. A 84, 022105 (2011)
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摘要：

当对纠缠的量子系统进行单独测量时，该理论预测了无法用任何经典机制解释的相关性：通信被排除在外，因为信号的传播速度应该比光快;预先建立的协议被排除在外，因为贝尔不等式被违反。所有这些违规行为的光学演示都涉及离散的自由度，并受到检测效率漏洞的困扰。一个有前途的替代方案是使用连续变量结合高效的零差测量。然而，到目前为止提出的所有方案都使用极难实现的状态或测量，或者产生非常弱的违反。我们提出了一个简单的方法来产生大的违规可行的状态，使用光子计数和零差检测。本方案也可用于从容易制备的高斯态（如双模压缩态）中获得非定域性。

英文摘要：

When separated measurements on entangled quantum systems are performed, the theory predicts correlations that cannot be explained by any classical mechanism: communication is excluded because the signal should travel faster than light; pre-established agreement is excluded because Bell inequalities are violated. All optical demonstrations of such violations have involved discrete degrees of freedom and are plagued by the detection-efficiency loophole. A promising alternative is to use continuous variables combined with highly efficient homodyne measurements. However, all the schemes proposed so far use states or measurements that are extremely difficult to achieve, or produce very weak violations. We present a simple method to generate large violations for feasible states using both photon counting and homodyne detections. The present scheme can also be used to obtain nonlocality from easy-to-prepare Gaussian states (e.g. two-mode squeezed state).

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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