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An atomic spin on amplification of light

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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Fig. 1: Circularly polarized photons travelling through optical nanofibres.
Fig. 2: Atomic level structure with two Lambda-type transitions.


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Correspondence to Kanu Sinha or Elizabeth A. Goldschmidt.

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The authors declare no competing interests.

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Sinha, K., Goldschmidt, E.A. An atomic spin on amplification of light. Nat. Photon. 16, 339–340 (2022).

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