Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, P.O. Box 51, Hungary.
Phys Rev Lett. 2010 Feb 12;104(6):060401. doi: 10.1103/PhysRevLett.104.060401. Epub 2010 Feb 11.
We show that the detection efficiencies required for closing the detection loophole in Bell tests can be significantly lowered using quantum systems of dimension larger than two. We introduce a series of asymmetric Bell tests for which an efficiency arbitrarily close to 1/N can be tolerated using N-dimensional systems, and a symmetric Bell test for which the efficiency can be lowered down to 61.8% using four-dimensional systems. Experimental perspectives for our schemes look promising considering recent progress in atom-photon entanglement and in photon hyperentanglement.
我们表明，使用维度大于二的量子系统可以显著降低在贝尔测试中关闭检测漏洞所需的检测效率。我们引入了一系列非对称贝尔测试，对于这些测试，可以容忍使用 N 维系统的效率任意接近 1/N，以及一个对称贝尔测试，使用四维度系统可以将效率降低到 61.8%。考虑到最近在原子-光子纠缠和光子超纠缠方面的进展，我们的方案在实验方面具有很大的前景。
