Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2013 Sep 27;111(13):130406. doi: 10.1103/PhysRevLett.111.130406. Epub 2013 Sep 26.
We present a source of entangled photons that violates a Bell inequality free of the "fair-sampling" assumption, by over 7 standard deviations. This violation is the first reported experiment with photons to close the detection loophole, and we demonstrate enough "efficiency" overhead to eventually perform a fully loophole-free test of local realism. The entanglement quality is verified by maximally violating additional Bell tests, testing the upper limit of quantum correlations. Finally, we use the source to generate "device-independent" private quantum random numbers at rates over 4 orders of magnitude beyond previous experiments.
我们展示了一种纠缠光子源，它在没有“公平抽样”假设的情况下违反了贝尔不等式，超过了 7 个标准差。这种违反是第一个报告的用光子关闭探测漏洞的实验，我们证明了足够的“效率”开销，最终可以对局部实在论进行完全无漏洞的测试。通过最大限度地违反其他贝尔测试来验证纠缠质量，测试量子相关性的上限。最后，我们使用该光源以比以前的实验高出 4 个数量级的速率生成“设备无关”的私有量子随机数。
