Noiseless photonic non-reciprocity via optically-induced magnetization

Xin-Xin Hu, Zhu-Bo Wang, Pengfei Zhang (), Guang-Jie Chen, Yan-Lei Zhang, Gang Li, Xu-Bo Zou, Tiancai Zhang, Hong X. Tang, Chun-Hua Dong (), Guang-Can Guo and Chang-Ling Zou ()
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Xin-Xin Hu: University of Science and Technology of China
Zhu-Bo Wang: University of Science and Technology of China
Pengfei Zhang: Shanxi University
Guang-Jie Chen: University of Science and Technology of China
Yan-Lei Zhang: University of Science and Technology of China
Gang Li: Shanxi University
Xu-Bo Zou: University of Science and Technology of China
Tiancai Zhang: Shanxi University
Hong X. Tang: Yale University
Chun-Hua Dong: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China
Chang-Ling Zou: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract The realization of optical non-reciprocity is crucial for many applications, and also of fundamental importance for manipulating and protecting the photons with desired time-reversal symmetry. Recently, various new mechanisms of magnetic-free non-reciprocity have been proposed and implemented, avoiding the limitation of the strong magnetic field imposed by the Faraday effect. However, due to the difficulties in separating the signal photons from the drive laser and the noise photons induced by the drive laser, these devices exhibit limited isolation performances and their quantum noise properties are rarely studied. Here, we demonstrate an approach of magnetic-free non-reciprocity by optically-induced magnetization in an atom ensemble. Excellent isolation (highest isolation ratio is $$51.{5}_{-2.5}^{+6.5}\ {\rm{dB}}$$ 51 . 5 − 2.5 + 6.5 dB ) is observed over a power dynamic range of 7 orders of magnitude, with the noiseless property verified by quantum statistics measurements. The approach is applicable to other atoms and atom-like emitters, paving the way for future studies of integrated photonic non-reciprocal devices.

Date: 2021
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DOI: 10.1038/s41467-021-22597-z

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