Inverse-designed quantum emitters enable ultralow-power nonlinear activations
bravo_abad · x · 2026-08-27
Optical neural networks excel at linear operations but struggle with nonlinearity, which typically requires high light intensity. Qingyi Zhou et al. propose a new approach:
- Mechanism: Using the saturation of a single quantum emitter as the nonlinear activation function.
- Structure: Embedding an SiV⁻ color center inside an inverse-designed GaP-on-diamond nanophotonic structure.
- Operation: At low intensity, the emitter scatters light strongly; as the field increases, it saturates and becomes transparent, creating a sharp nonlinear input-output response at extremely low power.
The study also uses ML to optimize the physical activation function design.
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