Abstract
Magnetic-free optical non-reciprocal components, such as isolators and circulators, are highly desirable for on-chip optical signal processing1,2 and quantum networks3,4. However, their realization presents a fundamental difficulty due to the Lorentz reciprocity in most optical devices5. In this study, we propose and experimentally realize optical non-reciprocity with atoms embedded in a ring cavity at room temperature. Random thermal motion of atoms, in the presence of a unidirectional control field, creates susceptibility–momentum locking, and subsequently a new type of chiral quantum optical system. Furthermore, we demonstrate strong non-reciprocity based on this chiral quantum system in the regime of collectively strong atom–cavity coupling. Our scheme provides a new routine towards the realization of chiral quantum optics and chip-compatible, non-magnetic optical non-reciprocity.
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The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (grant no. 2017YFA0303703), the National Natural Science Foundation of China (grant nos. 11474092, 11774089 and 11674094) and Shanghai Natural Science Foundation (grant nos. 17ZR1442700 and 18ZR1410500).
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G.L., Y.N. and K.X. contributed to the original idea, and supervised the experiment. S.Z. and Y.H. conducted the experiment and partly contributed to refining the idea. They contributed equally to this work. S.G. supervised the whole project. All authors contributed to discussions of the results and writing of the manuscript.
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Zhang, S., Hu, Y., Lin, G. et al. Thermal-motion-induced non-reciprocal quantum optical system. Nature Photon 12, 744–748 (2018). https://doi.org/10.1038/s41566-018-0269-2
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DOI: https://doi.org/10.1038/s41566-018-0269-2
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