Ann Arbor's Sygaldry raises $139M to build quantum computers for AI data centers

Sygaldry Technologies, an Ann Arbor-based startup developing quantum-accelerated AI servers, announced last week it had raised $139 million in combined Series A and seed financing.

The funding announcement was the first made by the company, breaking down into a $105 million Series A closed in March 2026, led by Breakthrough Energy Ventures, and an earlier $34 million seed round led by Initialized Capital in August last year according to Dealroom data. 

Additional investors listed in the company's announcement include Y Combinator, Rock Yard Ventures, IQT, the University of Michigan, QDNL Participations, Expeditions Fund, 468 Capital, Morpheus Ventures, WTI, Overmatch Ventures, RRE Ventures, and Switch Ventures.

Sygaldry says its servers are designed to run alongside classical infrastructure inside data centers, with the goal of reducing the cost and power required to train and operate large AI models. According to the company, the architecture combines multiple qubit types within a single fault-tolerant design, and the team is also building quantum algorithms intended to plug into tools AI researchers already use.

"We're building quantum computers that meet the specific requirements for AI processing," said co-founder and CEO Chad Rigetti in the announcement. Rigetti previously founded Rigetti Computing, one of the first commercial quantum computing companies, and departed that company in late 2022 before co-founding Sygaldry in 2024 with Idalia Friedson and AI scientist Michael Keiser. The company maintains offices in both Ann Arbor and San Francisco.

Breakthrough Energy Ventures partner Carmichael Roberts framed the investment in terms of AI's rising energy demands, saying Sygaldry's approach has the potential to bend "the cost and energy curve at the moment it matters most." The company cited industry estimates of $5.2 trillion in capital expenditure needed globally by 2030 to meet AI demand, including roughly 125 gigawatts of new power generation capacity.

Keiser said in the announcement that the company is working at the intersection of quantum and AI, adding that “our technology will accelerate the classical algorithms AI teams already rely on. In parallel, we are developing entirely new quantum-native approaches to AI that classical systems simply cannot match.”

Technical specifics on Sygaldry's qubit modalities, server configurations, timeline to commercial deployment, and customer pilots were not disclosed. Full fault tolerance at scale remains an open challenge across the quantum computing industry.

Ann Arbor SPARK, the regional economic development organization, also shared an announcement on the round, stating that it supported Sygaldry's relocation to Ann Arbor last year, assisting with talent recruitment and site selection, and that the company has established operations at Domino's Farms, an office complex in Ann Arbor adjacent to the global pizza chain’s HQ.