物理
光子
自发参量下转换
角动量
叠加原理
量子位元
量子信息
光子学
光的轨道角动量
量子光学
量子
量子力学
光学
总角动量
量子纠缠
作者
Bin Chen,Yuming Wei,Tiansheng Zhao,Shunfa Liu,Rongbin Su,Beimeng Yao,Ying Yu,Jin Liu,Xuehua Wang
标识
DOI:10.1038/s41565-020-00827-7
摘要
Photons that have a helical phase front, that is, twisted photons, can carry a discrete, in principle, unlimited, but quantized amount of orbital angular momentum (OAM). Hence, twisted single photons constitute a high-dimensional quantum system with information-processing abilities beyond those of two-level single-photon qubits. To date, the generation of single photons carrying OAM has relied on a non-linear process in bulk crystals, for example, spontaneous parametric down-conversion, which limits both the efficiency and the scalability of the source. Here, we present a bright solid-state source of single photons in an OAM superposition state with a single-photon purity of g(2)(0) = 0.115(1) and a collection efficiency of 23(4)%. The mode purity of the single-photon OAM states is further examined via projection measurements. Future developments of integrated quantum photonic devices with pure OAM states as an additional degree of freedom may enable high-dimensional quantum information processing. Single photons with high orbital angular momenta can act as higher order flying qubits, but efficient generation is scarce. The integration of a single quantum dot emitter into an on-chip mircoring resonator enables the generation of single photons in an orbital angular momentum superposition state.
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