title: Quantum Storage of Three-Dimensional Orbital-Angular-Momentum Entanglement in a Crystal.
abstract: Here we present the quantum storage of three-dimensional orbital-angular-momentum photonic entanglement in a rare-earth-ion-doped crystal. The properties of the entanglement and the storage process are confirmed by the violation of the Bell-type inequality generalized to three dimensions after storage (S=2.152±0.033). The fidelity of the memory process is 0.993±0.002, as determined through complete quantum process tomography in three dimensions. An assessment of the visibility of the stored weak coherent pulses in higher-dimensional spaces demonstrates that the memory is highly reliable for 51 spatial modes. These results pave the way towards the construction of high-dimensional and multiplexed quantum repeaters based on solid-state devices. The multimode capacity of rare-earth-based optical processors goes beyond the temporal and the spectral degree of freedom, which might provide a useful tool for photonic information processing.
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Zong-Quan
authors: ZQ
authors: Zhou
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Yi-Lin
authors: YL
authors: Hua
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Xiao
authors: X
authors: Liu
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Geng
authors: G
authors: Chen
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Jin-Shi
authors: JS
authors: Xu
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Yong-Jian
authors: YJ
authors: Han
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Chuan-Feng
authors: CF
authors: Li
authors: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
authors: Guang-Can
authors: GC
authors: Guo