Related papers: Efficient multiplexed quantum memory with high dimensional orbital angular momentum states in cold atoms

Efficient multiplexed quantum memory with high dimensional orbital angular momentum states in cold atoms

URL: http://arxiv.org/abs/2503.01106v1
Date: Mon, 03 Mar 2025 02:21:47 GMT
Title: Efficient multiplexed quantum memory with high dimensional orbital angular momentum states in cold atoms
Authors: Xin Yang, Chengyuan Wang, Jinwen Wang, Mingtao Cao, Yun Chen, Hong Chang, Ruifang Dong, Shougang Zhang, Dong Wei, Pei Zhang, Fuli Li, Hong Gao,
Abstract summary: We experimentally demonstrate an efficient multiplexed quantum memory by consolidating photons carrying high-dimensional orbital angular momentum (OAM) state from 4 individual channels into an elongated cold $87$Rb atomic ensemble.<n>The storage fidelities surpass 83% when all channels are operated in a 4-dimensional Hilbert space, which is far above the classical benchmark and validates the quantum functionality of our memory system.
Score: 20.36722652890431
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Quantum memory plays a pivotal role in the construction of quantum repeaters, which are essential devices for establishing long-distance quantum communications and large-scale quantum networks. To boost information capacity and signal processing speed, the implementation of high-efficiency multiplexed quantum memories is essential for the development of multiplexed quantum repeaters. In this work, we experimentally demonstrate an efficient multiplexed quantum memory by consolidating photons carrying high-dimensional orbital angular momentum (OAM) state from 4 individual channels into an elongated cold $^{87}$Rb atomic ensemble. Benefiting from the cold atomic ensemble with high optical depth, we obtain a storage efficiency exceeding 70% for the 4-channel multiplexed beam. The storage fidelities surpass 83% when all channels are operated in a 4-dimensional Hilbert space, which is far above the classical benchmark and validates the quantum functionality of our memory system. The achieved high-efficiency OAM multiplexed quantum memory opens up an avenue for efficient quantum information processing over multiple parallel channels, promising significant advances in the field of quantum communication and networking.

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