Sygaldry, backed by ZAKA VC, raises $139M to build quantum-accelerated AI infrastructure

Sygaldry Technologies has raised $139 million across Seed and Series A to build quantum-accelerated servers for AI data centers.

The $105 million Series A was led by Breakthrough Energy Ventures, following a $34 million seed round led by Initialized Capital. Other investors include Y Combinator, Pioneer Fund, RRE Ventures, IQT, 468 Capital, Expeditions Fund, Rock Yard Ventures, as well as several other well-known Silicon Valley investors.

Sygaldry is focused on a constraint that is becoming increasingly visible across AI: the cost and energy required to run large-scale models. Rather than replacing existing infrastructure, the company is building quantum-accelerated servers designed to work alongside GPUs, improving how efficiently compute is delivered within data centers.

A key part of that approach is architectural. While many quantum companies are pushing a single qubit technology, Sygaldry combines multiple qubit types within one system. The idea is straightforward: use each where it performs best, and avoid over-relying on any single approach. The result is a system designed with deployment in mind — not just performance in isolation, but usability at scale.

The company is led by Chad Rigetti, one of the early pioneers of the quantum computing industry, together with Idalia Friedson and Michael Keiser.

“We’re building quantum computers that meet the specific requirements for AI processing, with the goal of enabling a fundamentally more efficient way of converting megawatts into intelligence,” said Chad Rigetti.

ZAKA VC first invested in Sygaldry through Fund I in June 2025, shortly after the company emerged from the Y Combinator Spring 2025 batch, and also participated in the Series A round announced this month — less than a year after the initial investment, reflecting both strong execution and the urgency of the problem the company is addressing.

“The team is focused on a real bottleneck in AI, executing really well, and operating in a massive market. That’s exactly the kind of company we want to back,” said Jan Kasper, Co-Founder and Managing Partner at ZAKA VC.