Multiplexed storage and real-time manipulation based on a multiple degree-of-freedom quantum memory

Tian-Shu Yang, Zong-Quan Zhou (), Yi-Lin Hua, Xiao Liu, Zong-Feng Li, Pei-Yun Li, Yu Ma, Chao Liu, Peng-Jun Liang, Xue Li, Yi-Xin Xiao, Jun Hu, Chuan-Feng Li () and Guang-Can Guo
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Tian-Shu Yang: University of Science and Technology of China
Zong-Quan Zhou: University of Science and Technology of China
Yi-Lin Hua: University of Science and Technology of China
Xiao Liu: University of Science and Technology of China
Zong-Feng Li: University of Science and Technology of China
Pei-Yun Li: University of Science and Technology of China
Yu Ma: University of Science and Technology of China
Chao Liu: University of Science and Technology of China
Peng-Jun Liang: University of Science and Technology of China
Xue Li: University of Science and Technology of China
Yi-Xin Xiao: University of Science and Technology of China
Jun Hu: University of Science and Technology of China
Chuan-Feng Li: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract The faithful storage and coherent manipulation of quantum states with matter-systems would enable the realization of large-scale quantum networks based on quantum repeaters. To achieve useful communication rates, highly multimode quantum memories are required to construct a multiplexed quantum repeater. Here, we present a demonstration of on-demand storage of orbital-angular-momentum states with weak coherent pulses at the single-photon-level in a rare-earth-ion-doped crystal. Through the combination of this spatial degree-of-freedom (DOF) with temporal and spectral degrees of freedom, we create a multiple-DOF memory with high multimode capacity. This device can serve as a quantum mode converter with high fidelity, which is a fundamental requirement for the construction of a multiplexed quantum repeater. This device further enables essentially arbitrary spectral and temporal manipulations of spatial-qutrit-encoded photonic pulses in real time. Therefore, the developed quantum memory can serve as a building block for scalable photonic quantum information processing architectures.

Date: 2018
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DOI: 10.1038/s41467-018-05669-5

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