QCNEWS
In the Quantum Benchmarking Initiative's final stage, DARPA gets on site access to light based quantum computer maker PsiQuantum, paying to verify rather than to buy.
PsiQuantum, a Palo Alto company building a quantum computer that processes information with single particles of light rather than superconducting circuits, has signed a $125 million expansion of an existing US defense agreement that will put federal auditors on the company's chip production line, packaging floor, and cryogenic test cabinets.
The new tasking extends Stage C of DARPA's Quantum Benchmarking Initiative (QBI), the program's final independent technical verification phase. It is performance-based, paid out as PsiQuantum hits agreed milestones rather than as a single procurement, and PsiQuantum calls it the company's largest US government contract to date. Trade outlet Quantum Computing Report first reported the expansion.
Four DARPA-led on-site verification streams will run in parallel at PsiQuantum's Milpitas PsiFactory and other sites. Auditors will inspect the yield of barium titanate electro-optic modulators, thin-film devices that convert electrical control signals into optical ones and one of the company's most proprietary hardware bets, during production runs. DARPA teams will examine the automated assembly that bonds photonic chips to optical fibers and to the cryogenic wiring that carries signals into a dilution refrigerator. The agency will verify the cabinet-scale cooling infrastructure needed to operate a photonic quantum computer at the temperatures required for single-photon detection. On PsiQuantum's Construct compiler, the proprietary software the company uses to translate user algorithms into fault-tolerant operations across its hardware, auditors will run live benchmarks. Independent validation of resource estimates, not just hardware, is what QBI Stage C was designed to force.
A $125 million performance-based tasking buys DARPA the right to spend months in PsiQuantum's production environment and to publish independent technical findings on each stream. The dollar figure itself is less informative than what the agency will see.
The expansion builds on a $31.8 million Stage C award from September 2025 and folds into a broader capital stack PsiQuantum has been assembling in 2026. In May, the US Department of Commerce signed a Letter of Intent for roughly $100 million in proposed CHIPS and Science Act direct funding to PsiQuantum. That LOI is not finalized funding and remains contingent on further review. State-level Illinois commitments and PsiQuantum's anchor role at the Illinois Quantum and Microelectronics Park in Chicago layer underneath the federal support.
Independent technical grounding for the company's manufacturing approach comes from a 2025 Nature paper demonstrating a manufacturable photonic platform with the components DARPA is now being allowed to inspect. That paper is the closest external peer-reviewed evidence that the hardware in the new audit streams is real and at the stated scale. It is not an endorsement of PsiQuantum's commercial timeline.
PsiQuantum's stated target is to deliver a "commercially useful, fault-tolerant" quantum computer before 2033, a company claim, not an audited milestone. The Stage C audit program was designed to test that roadmap by running independent verification of utility-scale hardware architecture, photonic manufacturing, and cryogenic infrastructure, the gating items PsiQuantum itself names. The audit outputs DARPA's teams produce at each of the four streams will be the next publicly observable milestones, published as they happen rather than as a single end-of-program report.