PsiQuantum locked into photonics supply chain

PsiQuantum has tied its technical roadmap to a custom semiconductor supply chain, not just to a scientific idea. Its chips depend on GlobalFoundries 300mm wafer lines, added materials like superconducting films and Barium Titanate, and dedicated production tools installed for PsiQuantum in multiple fabs. If photonic qubits stall, switching to trapped ions or superconducting circuits would mean rebuilding the hardware stack, manufacturing process, and years of process learning almost from zero.

• This is deeper than a normal foundry relationship. PsiQuantum has put proprietary equipment into two GlobalFoundries fabs, funded new tools, and run more than 1,000 wafers through a 25 layer process with 500 plus manufacturing steps. That creates real scale advantage, but also locks the company into this exact path.
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• The lock in sits at the component level. PsiQuantum is not buying generic silicon photonics. It is manufacturing single photon detectors, sources, and fast optical switches inside the foundry flow, including millions of waveguide integrated detectors and a custom BTO switching process. Those pieces are specific to photonic computing, not portable across architectures.
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• The closest comparable is Xanadu, which also uses a major foundry, TSMC, for photonic chips. That matters because it shows foundry integration is becoming a competitive moat in photonic quantum, while companies like IonQ and Rigetti are optimizing around completely different device physics, tooling, and talent bases.
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Going forward, the winners in quantum may be the teams that turn fragile lab science into repeatable factory output. PsiQuantum is betting that foundry scale will matter more than flexibility. If silicon photonics works, this integration becomes its strongest advantage. If it does not, the same integration turns into the hardest thing in the company to unwind.