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Noise Suppression in a Temporal-multimode Quantum Memory Entangled with a Photon via Asymmetrical Photon-collection Channel by Li, Ya; Wen, Ya-fei; Wang, Min-jie; Liu, Chao; Liu, Hai-long; Li, Shu-jing; Xu, Zhong-xiao; Wang, Hai is a scholarly article available to read on EtoBox.

What is Noise Suppression in a Temporal-multimode Quantum Memory Entangled with a Photon via Asymmetrical Photon-collection Channel about?

Quantum interfaces (QIs) that generate entanglement between a multimode atomic memory and a photon forms a multiplexed repeater node and hold promise to greatly improve quantum repeater rates. Recently, the temporal multimode spin-wave memory that is entangled with a photon has been demonstrated with cold atoms. However, due to additional noise generated in multimode operation, the fidelity of spin-wave-photon entanglement significantly decreases with the mode number. So far, the improvement on temporal-multimode entanglement fidelity via suppressing the additional noise remains unexplored. Here, we propose and experimentally demonstrate a scheme that can suppress the additional noise of a temporally-multiplexed QI. The scheme uses an asymmetric channel to collect the photons coming and retrieving from the temporally-multiplexed QI. For making comparisons, we also set up a QI that uses symmetric channel for the photon collections. When the QIs store 14 modes, the measured Bell parameter S for the QIs using the asymmetric and the symmetric photon-collection channels are 2.36+/-0.03 and 2.24+/-0.04, respectively, showing that the QI using the asymmetric channel gives rise to a 3% inc

Author

Li, Ya; Wen, Ya-fei; Wang, Min-jie; Liu, Chao; Liu, Hai-long; Li, Shu-jing; Xu, Zhong-xiao; Wang, Hai

Published

2021

Language

EN