PsiQuantum
Building a fault-tolerant photonic quantum computer using semiconductor manufacturing.
Quant Score history
What they do
PsiQuantum is pursuing large-scale, fault-tolerant quantum computing using silicon photonics, aiming to manufacture qubits on standard semiconductor processes at commercial foundry scale. Its thesis is that useful quantum computing requires a million-plus physical qubits, and that photonics is the most manufacturable path there.
The company is heavily funded and partners with foundries and governments, including major utility-scale system projects.
Strengths & weaknesses
- +Manufacturing-first strategy leveraging existing semiconductor foundries
- +Very well capitalized among private quantum companies
- +Government-backed utility-scale system commitments
- –No incremental cloud-accessible product today — a long-horizon bet
- –Photonic fault-tolerance at scale remains unproven
- !Binary, milestone-driven outcome given the all-in fault-tolerant approach
- !Long time-to-revenue increases financing exposure
Score breakdown
€570m Series E, Nov 2025.
50th percentile within Photonic.
~900 employees.
36th percentile within Photonic.
Funding history
€1.3bn total raised · rounds below sum to €570m (includes undisclosed rounds)
Signals
Management
Major shareholders
Similar companies
Links & resources
Company website↗Sources: Dealroom · EPO · USPTO · arXiv · Company filings — Updated weekly · ▼ 10.5 (30d)