Shalm Lynden K, Meyer-Scott Evan, Christensen Bradley G, Bierhorst Peter, Wayne Michael A, Stevens Martin J, Gerrits Thomas, Glancy Scott, Hamel Deny R, Allman Michael S, Coakley Kevin J, Dyer Shellee D, Hodge Carson, Lita Adriana E, Verma Varun B, Lambrocco Camilla, Tortorici Edward, Migdall Alan L, Zhang Yanbao, Kumor Daniel R, Farr William H, Marsili Francesco, Shaw Matthew D, Stern Jeffrey A, Abellán Carlos, Amaya Waldimar, Pruneri Valerio, Jennewein Thomas, Mitchell Morgan W, Kwiat Paul G, Bienfang Joshua C, Mirin Richard P, Knill Emanuel, Nam Sae Woo
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada, N2L 3G1.
Phys Rev Lett. 2015 Dec 18;115(25):250402. doi: 10.1103/PhysRevLett.115.250402. Epub 2015 Dec 16.
We present a loophole-free violation of local realism using entangled photon pairs. We ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and by using fast random number generators and high-speed polarization measurements. A high-quality polarization-entangled source of photons, combined with high-efficiency, low-noise, single-photon detectors, allows us to make measurements without requiring any fair-sampling assumptions. Using a hypothesis test, we compute p values as small as 5.9×10^{-9} for our Bell violation while maintaining the spacelike separation of our events. We estimate the degree to which a local realistic system could predict our measurement choices. Accounting for this predictability, our smallest adjusted p value is 2.3×10^{-7}. We therefore reject the hypothesis that local realism governs our experiment.
我们利用纠缠光子对实现了无漏洞的局域实在性违背。通过将实验方放置得足够远，并使用快速随机数发生器和高速偏振测量，我们确保了贝尔测试中所有相关事件在类空上是分离的。高质量的偏振纠缠光子源，结合高效、低噪声的单光子探测器，使我们能够在无需任何公平采样假设的情况下进行测量。通过假设检验，我们在保持事件类空分离的同时，计算出贝尔违背的p值小至5.9×10⁻⁹。我们估计了局域实在性系统能够预测我们测量选择的程度。考虑到这种可预测性，我们最小的调整后p值为2.3×10⁻⁷。因此，我们拒绝局域实在性支配我们实验的假设。
