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Experimental realization of quantum non-reciprocity based on cold atomic ensembles
preprintposted on 2023-11-30, 18:51 authored by Ming-Xin Dong, Yi-Chen Yu, Ying-Hao Ye, Wei-Hang Zhang, En-Ze Li, Lei Zeng, Guang-Can Guo, Dong-Sheng Ding, Bao-Sen Shi
In analog to counterparts widely used in electronic circuits, all optical non-reciprocal devices are basic building blocks for both classical and quantum optical information processing. Approaching the fundamental limit of such devices, where the propagation of a single photon exhibits a good non-reciprocal characteristic, requires an asymmetric strong coupling between a single photon and a matter. Unfortunately it has been not realized yet. Here, we propose and experimentally realize a quantum non-reciprocity device with low optical losses and a high isolation of larger than 14 dB based on the cold atoms. Besides, the non-reciprocal transmission of a quantum qubit and non-reciprocal quantum storage of a true single photon are also realized. All results achieved would be very promising in building up quantum non-reciprocal devices for quantum networks.