Walther Philip, Resch Kevin J, Brukner Caslav, Zeilinger Anton
Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria.
Phys Rev Lett. 2006 Jul 14;97(2):020501. doi: 10.1103/PhysRevLett.97.020501. Epub 2006 Jul 11.
All previous tests of local realism have studied correlations between single-particle measurements. In the present experiment, we have performed a Bell experiment on three particles in which one of the measurements corresponds to a projection onto a maximally entangled state. We show theoretically and experimentally that correlations between these entangled measurements and single-particle measurements are too strong for any local-realistic theory and are experimentally exploited to violate a Clauser-Horne-Shimony-Holt-Bell inequality by more than 5 standard deviations. We refer to this possibility as "entangled entanglement."
此前所有关于局域实在性的测试都研究了单粒子测量之间的相关性。在本实验中，我们对三个粒子进行了贝尔实验，其中一个测量对应于投影到最大纠缠态上。我们通过理论和实验表明，对于任何局域实在论理论而言，这些纠缠测量与单粒子测量之间的相关性都太强了，并且在实验中利用这种相关性违反了克劳泽 - 霍恩 - 希莫尼 - 霍尔特 - 贝尔不等式超过5个标准差。我们将这种可能性称为“纠缠的纠缠”。
