PsiQuantum
Photonic fault-tolerant quantum computers
Ranked #1 in Best Quantum Computing Startups, and on 1 more ranking.
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 1st of 10 in Best Quantum Computing Startups (Lister Score 96.8) and 4th of 10 in Best Deep Tech Startups to Watch (Lister Score 93.3).
#1 in Best Quantum Computing Startups · Lister Score 96.8
PsiQuantum, founded in 2015 and based in Palo Alto, California, builds fault-tolerant quantum computers using photonic qubits made with standard semiconductor processes. It raised a $1 billion Series E at a $7 billion valuation in September 2025 and is building sites near Brisbane, Australia and in Chicago.
PsiQuantum raised $1 billion at a $7 billion valuation in September 2025..
| Rank | Best Quantum Computing Startups | Score |
|---|---|---|
| 1 | PsiQuantum | 96.8 |
| 2 | QuEra Computing | 95.5 |
| 3 | Atom Computing | 94.3 |
| 4 | Oxford Quantum Circuits | 93.0 |
| 5 | Alice & Bob | 91.7 |
| 6 | Quantum Machines | 90.4 |
| 7 | Classiq | 89.1 |
| 8 | Riverlane | 87.8 |
| 9 | Photonic | 86.4 |
| 10 | Q-CTRL | 85.1 |
#4 in Best Deep Tech Startups to Watch · Lister Score 93.3
PsiQuantum is building quantum compute centres in Chicago and in Brisbane, where the Australian and Queensland governments committed A$940 million..
| Rank | Best Deep Tech Startups to Watch | Score |
|---|---|---|
| 1 | Anduril Industries | 96.8 |
| 2 | Commonwealth Fusion Systems | 95.6 |
| 3 | Helsing | 94.5 |
| 4 | PsiQuantum | 93.3 |
| 5 | Shield AI | 92.0 |
| 6 | Figure AI | 90.8 |
| 7 | Saronic Technologies | 89.5 |
| 8 | Hadrian | 88.2 |
| 9 | Stoke Space | 86.9 |
| 10 | Varda Space Industries | 85.6 |
Frequently asked questions
How does PsiQuantum rank on Lister?
PsiQuantum is ranked 1st of 10 in Best Quantum Computing Startups (Lister Score 96.8) and 4th of 10 in Best Deep Tech Startups to Watch (Lister Score 93.3).
Appears in
Best Quantum Computing Startups
1PsiQuantum96.82
QuEra Computing95.53
Atom Computing94.3RANKINGfull ranking →STARTUPSVERIFIEDBest Deep Tech Startups to Watch
1
Anduril Industries96.82
Commonwealth Fusion Systems95.63
Helsing94.5RANKINGfull ranking →- #5 in Best Quantum Computing Companies · Deep Tech
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