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.

中文翻译：

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关于光放大的原子自旋

非互易物理系统表现出与方向相关的光传播，从而实现了二极管和循环器等无数设备。一项新实验证明了通过原子自旋对光进行非互易放大，通过光学纳米纤维在单向街道上驱动光子。