P
PsiQuantum
Building a fault-tolerant photonic quantum computer using semiconductor manufacturing.
PhotonicSeries D+ Pre-IPOIPO 2027Palo Alto · Founded 2016
91
▲ 1.2
#1 of Photonic
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
Strengths
- +Manufacturing-first strategy leveraging existing semiconductor foundries
- +Very well capitalized among private quantum companies
- +Government-backed utility-scale system commitments
Watch-outs
- –No incremental cloud-accessible product today — a long-horizon bet
- –Photonic fault-tolerance at scale remains unproven
Key risks
- !Binary, milestone-driven outcome given the all-in fault-tolerant approach
- !Long time-to-revenue increases financing exposure
Score breakdown
Funding momentum 40%96
€570m Series E, nov. 2025.
Patents 25%90
90th percentile within Photonic.
Talent 20%85
~900 employees.
Research 15%88
88th percentile within Photonic.
Funding history
Series E€570m
nov. 2025 · Led by BlackRock
Signals
N+0.2
PsiQuantum lands $179 million DARPA quantum computing deal
för 3 dagar sedan · GDELT (global news) ↗
N+0.2
PsiQuantum lands $179 million DARPA quantum computing deal
för 3 dagar sedan · GDELT (global news) ↗
N+0.2
Global Quantum Forum Opens in Chicago Amid Encryption Countdown and $9B Park
för 6 dagar sedan · GDELT (global news) ↗
N+0.2
Global Quantum Forum Opens in Chicago Amid Encryption Countdown and $9B Park
för 6 dagar sedan · GDELT (global news) ↗
N+0.2
Global Leaders , Fortune 500 CEOs and Tech Visionaries Convene in Chicago for Second Annual Global Quantum Forum
för 7 dagar sedan · GDELT (global news) ↗
N+0.2
Global Leaders , Fortune 500 CEOs and Tech Visionaries Convene in Chicago for Second Annual Global Quantum Forum
för 7 dagar sedan · GDELT (global news) ↗
Management
Jeremy O'Brien
Co-founder & Chief Executive Officer
Major shareholders
Venture & strategic investorsvc
Similar companies
72
Xanadu
Series C · Toronto
71
Quandela
Series B · Massy
68
Sparrow Quantum
Series A · Copenhagen
Links & resources
Company website↗Sources: Dealroom · EPO · USPTO · arXiv · Company filings — Updated weekly · ▲ 1.2 (30d)