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PsiQuantum

California-based startup building photonic quantum computers fabricated with standard semiconductor processes.

Founders

Jeremy O'Brien (Australia · ♂) — An Australian quantum physicist who led Bristol's Centre for Quantum Photonics, O'Brien co-founded PsiQuantum in 2016 to build a million-qubit fault-tolerant quantum computer using silicon photonics.
Terry Rudolph (United Kingdom · ♂) — An Imperial College quantum theorist (and grandson of Erwin Schroedinger), Rudolph co-founded PsiQuantum in 2016 as chief architect of its photonic quantum-computing approach.
Pete Shadbolt (United Kingdom · ♂) — A quantum-photonics researcher trained at Bristol and Imperial, Shadbolt co-founded PsiQuantum in 2016 as Chief Scientific Officer.
Mark Thompson (United Kingdom · ♂) — A silicon-photonics researcher at Bristol, Thompson co-founded PsiQuantum in 2016 as Chief Technologist to manufacture photonic quantum chips at scale.
Sanjay Vishwakarma

Shares the most investors with (number = shared investors):

Date	Round	Amount
Sep 2025	Series D Plus PsiQuantum closed a $1 billion Series E led by BlackRock at a $7 billion valuation to scale its photonic quantum systems.	$1B
Apr 2024	Grant PsiQuantum secured AUD 940m from the Australian Commonwealth and Queensland governments (equity, grants and loans) to build a utility-scale quantum computer near Brisbane.	$615M

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