Non-reciprocal physical systems exhibit direction-dependent propagation of light, enabling a myriad of devices such as diodes and circulators. A new experiment demonstrates non-reciprocal amplification of light via atomic spins, driving photons on a one-way street through optical nanofibres.
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Sinha, K., Goldschmidt, E.A. An atomic spin on amplification of light. Nat. Photon. 16, 339–340 (2022). https://doi.org/10.1038/s41566-022-00992-2