Photonics offers high hopes for next-generation neural network processors. Now it has been shown that even entirely using off-the-shelf photonics allows surpassing speed and energy efficiency of cutting-edge GPUs.
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Brunner, D., Psaltis, D. Competitive photonic neural networks. Nat. Photonics 15, 323–324 (2021). https://doi.org/10.1038/s41566-021-00803-0