About Lumai
Lumai is building an optical AI accelerator that does matrix multiplication, the core arithmetic of neural networks, with beams of light travelling through three-dimensional free space instead of etched waveguides on a chip. The company argues this avoids scaling limits of integrated photonics. It spun out of the University of Oxford in 2022 and is based in Oxford, England. In April 2025 it announced more than 10 million dollars of venture funding in a round led by Constructor Capital. Performance claims, such as large efficiency gains over silicon, come from the company and are unverified.
Lumai was founded in 2021 and is based in Oxford, UK, United Kingdom. It is listed under Photonic Computing. Reported funding is $10M+ (April 2025, led by Constructor Capital).
Compute Technologies
- Photonics
What Lumai works on
Photonic Computing
Photonic computing uses light instead of electricity to carry or process information. Photons have no charge, so light in a waveguide does not cause the resistive heating that current in a wire does, though lasers and modulators still use power, and many wavelengths can share one waveguide. The industry has two quite different parts: moving data with light, and computing with light.
Also in United Kingdom
RedWave Labs, Nu Quantum, Salience Labs, Duality Quantum Photonics, Wave Photonics
