Sygaldry, a startup founded by quantum-computing entrepreneur Chad Rigetti, announced on 14 April 2026 that it has raised $139m in total, including a $105m Series A led by Breakthrough Energy Ventures. Fortune, which reported the news first, said the Series A closed in March. No valuation was disclosed.
The rest of the money came from an earlier seed round of $34m led by Initialized Capital, according to Fortune and The Quantum Insider. Fortune said that round closed in August, without giving the year.
What Sygaldry is building
Sygaldry designs servers for AI data centres that combine quantum hardware with conventional chips. Fortune reported that the aim is to work with several types of quantum hardware to speed up AI workloads beyond what Nvidia's graphics processors can do. The Quantum Insider described the product as quantum-accelerated AI servers that operate alongside classical infrastructure and are meant to cut the cost and power needed to train and run large models.
The company is also developing quantum algorithms that work with the tools AI researchers already use, as well as quantum-native approaches to AI, The Quantum Insider reported. Rigetti's goal, according to Fortune, is to have machines in commercial production that speed up AI workloads around the end of the decade. Neither report gave a product name, a delivery date for a first system or evidence of a speed advantage.
Rigetti said the company is building quantum computers that meet the specific requirements of AI processing, according to The Quantum Insider, and Keiser said the technology will accelerate the classical algorithms that AI teams already rely on. Fortune quoted Rigetti arguing that quantum will be a fundamentally more efficient way of translating power into intelligence.
The founders
Fortune named Rigetti, Idalia Friedson and Michael Keiser as the founders. The Quantum Insider named Rigetti as chief executive and co-founder and Keiser as co-founder. Rigetti founded Rigetti Computing in 2013 and took it public through a special-purpose acquisition company in 2022. According to Fortune, he left that company and co-founded Sygaldry in 2024.
Investors
Besides the two lead investors, The Quantum Insider listed 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. Fortune named Daniel Dart, the founder of Rock Yard Ventures, as an investor.
Carmichael Roberts, a managing partner at Breakthrough Energy Ventures, said, according to Fortune, that the energy intensity of large language models continues to grow at a rate that is unsustainable. The Quantum Insider cited an estimate that $5.2tn of capital spending will be needed by 2030 to meet global AI demand, including about 125 GW of new power generation.
What is not disclosed
Neither report gave Sygaldry's headquarters, headcount or a breakdown of how it will spend the money. Fortune also did not say how many customers or partners the company has.
Company website: sygaldry.com