# PsiQuantum prototypes optical circuit switch for AI data centers

> Original title: Quantum computing company’s first breakthrough is in AI data centers

- Source: Semafor · Technology
- Published: 2026-10-28T16:26:08.000Z
- Bad Influence: https://badinfluence.news/items/ma9mdsfxlzhcfn3rhnbeflmf0
- Original: https://www.semafor.com/article/10/28/2026/quantum-computing-companys-first-breakthrough-is-in-ai-data-centers

## Summary

PsiQuantum says it has shown customers a prototype optical circuit switch that routes light signals between GPUs across data centers without converting them to electrical signals. The prototype reached an insertion loss of 1.2 decibels, below the two to three decibel limit PsiQuantum says AI data centers require. Google is the only major hyperscaler currently using purely optical circuit switching in an AI data center, using MEMS mirrors.