Lightmatter

Lightmatter builds photonic computing and interconnect hardware for AI and high‑performance computing data centers. Its products include Envise, a photonic AI accelerator, and Passage, a 3D‑stacked photonics engine that links large numbers of processors at high bandwidth and low latency. Founded in 2017 and headquartered in Mountain View, California, the privately held company sells chips and systems to data center operators and AI infrastructure providers.