High-Dimensional Bell Test without Detection Loophole
High-Dimensional Bell Test without Detection Loophole
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无检测漏洞的高维贝尔测试
DOI：
10.1103/physrevlett.129.060402
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发表时间：
2022
影响因子：
8.6
通讯作者：
Guang-Can Guo
中科院分区：
文献类型：
--
作者：
Xiao-Min Hu;Chao Zhang;Bi-Heng Liu;Yu Guo;Wen-Bo Xing;Cen-Xiao Huang;Yun-Feng Huang;Chuan-Feng Li;Guang-Can Guo
对贝尔不等式的违反表明量子力学和局域实在论之间的强烈冲突。无漏洞的贝尔测试不仅加深了对量子力学的理解，而且也是量子信息中设备无关（DI）任务的重要基础。高维量子系统提供了一个显着的优势，量子比特关闭检测漏洞。在对称场景中，使用四维状态和四设置贝尔不等式可以容忍低至61.8%的检测效率[Phys. Rev. Lett. 104，060401（2010）PRLTAO0031-900710.1103/PhysRevLett.104.060401。我们首次证明了四维纠缠光子违反贝尔不等式，同时在实验中关闭了检测漏洞。四维纠缠源的探测效率约为71.7%，态的保真度为0.995±0.001。结合多芯光纤技术，实现无环隙的高维贝尔实验和高维量子DI技术是很有前途的。
Violation of Bell's inequalities shows strong conflict between quantum mechanics and local realism. Loophole-free Bell tests not only deepen understanding of quantum mechanics, but are also important foundations for device-independent (DI) tasks in quantum information. High-dimensional quantum systems offer a significant advantage over qubits for closing the detection loophole. In the symmetric scenario, a detection efficiency as low as 61.8% can be tolerated using four-dimensional states and a four-setting Bell inequality [Phys. Rev. Lett. 104, 060401 (2010)PRLTAO0031-900710.1103/PhysRevLett.104.060401. For the first time, we show that four-dimensional entangled photons violate a Bell inequality while closing the detection loophole in experiment. The detection efficiency of the four-dimensional entangled source is about 71.7%, and the fidelity of the state is 0.995±0.001. Combining the technique of multicore fibers, the realization of loophole-free high-dimensional Bell tests and high-dimensional quantum DI technologies are promising.