PsiQuantum, founded in 2015 in Palo Alto, California, is building utility-scale quantum computers from silicon photonic chips made in commercial semiconductor fabs. In September 2025 it raised a $1 billion Series E at a $7 billion valuation, led by BlackRock affiliates, Temasek and Baillie Gifford.
At a glance
| Price from | Custom |
| Best for | Governments and enterprises planning large-scale quantum computing |
From PsiQuantum's own website.
What stands out
- Chips made in commercial fabs
- Major government backing in Australia and the US
Worth knowing
- No commercial machine yet
- Depends on an unproven scale-up
How it ranks
PsiQuantum is ranked 5th of 10 in Best Quantum Computing Companies (Lister Score 92.1).
#5 in Best Quantum Computing Companies · Lister Score 92.1
PsiQuantum, based in Palo Alto, California, is building photonic quantum computers made with standard semiconductor processes, aiming at million-qubit, fault-tolerant machines. It raised $1 billion in a Series E in September 2025.
PsiQuantum raised $1 billion in September 2025 to build million-qubit-scale, fault-tolerant machines, according to The Quantum Insider..
| Rank | Best Quantum Computing Companies | Score |
|---|---|---|
| 1 | IBM Quantum | 96.9 |
| 2 | Google Quantum AI | 95.7 |
| 3 | Quantinuum | 94.6 |
| 4 | IonQ | 93.4 |
| 5 | PsiQuantum | 92.1 |
| 6 | QuEra Computing | 90.8 |
| 7 | D-Wave Quantum | 89.5 |
| 8 | Atom Computing | 88.2 |
| 9 | IQM Quantum Computers | 86.9 |
| 10 | Rigetti Computing | 85.6 |
Frequently asked questions
How does PsiQuantum rank on Lister?
PsiQuantum is ranked 5th of 10 in Best Quantum Computing Companies (Lister Score 92.1).
Appears in
- #1 in Best Quantum Computing Startups · Startups
- #4 in Best Deep Tech Startups to Watch · Startups
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