Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities
Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities
复制标题
DOI：
10.1038/nphys1996
复制
发表时间：
2011-09-01
期刊：
影响因子：
19.6
通讯作者：
Andersson, Erika
中科院分区：
文献类型：
--
作者：
Dada, Adetunmise C.;Leach, Jonathan;Andersson, Erika
量子纠缠（1，2）在许多量子信息和通信任务中起着至关重要的作用（3）。高维系统的纠缠态由于其提供的扩展的可能性而引起极大的兴趣。例如，它们能够实现新型的量子信息方案，与纠缠二维系统相比，这种方案可以提供更高的信息密度编码和更大的错误恢复能力（参见参考文献4及其参考文献）。当使用高维纠缠系统时，在贝尔测试实验中关闭检测漏洞也更具实验可行性（5）。我们测量了两个光子之间以前未经测试的相关性，以实验证明高维纠缠态。我们得到了推广到d维系统（6）直到d = 12的Bell型不等式的破坏.此外，违反足够强，表明真正的11维纠缠。我们的实验使用的光子纠缠在轨道角动量（7），通过自发参数下转换（8，9）产生，并使用计算机控制的全息图操纵。
Quantum entanglement(1,2) plays a vital role in many quantum-information and communication tasks(3). Entangled states of higher-dimensional systems are of great interest owing to the extended possibilities they provide. For example, they enable the realization of new types of quantum information scheme that can offer higher-information-density coding and greater resilience to errors than can be achieved with entangled two-dimensional systems (see ref. 4 and references therein). Closing the detection loophole in Bell test experiments is also more experimentally feasible when higher-dimensional entangled systems are used(5). We have measured previously untested correlations between two photons to experimentally demonstrate high-dimensional entangled states. We obtain violations of Bell-type inequalities generalized to d-dimensional systems(6) up to d = 12. Furthermore, the violations are strong enough to indicate genuine 11-dimensional entanglement. Our experiments use photons entangled in orbital angular momentum(7), generated through spontaneous parametric down-conversion(8,9), and manipulated using computer-controlled holograms.