S-Transistors, a Finnish deep-tech startup spun out of VTT Technical Research Centre of Finland, has raised €2.6 million in pre-seed funding to develop integrated circuits based on superconducting transistors. Lifeline Ventures led the round, with participation from an angel investor.
Scaling Quantum Computing Hardware
The funding will support product prototypes for cryogenic signal control, a dedicated cryogenic laboratory, a manufacturing pilot line and team expansion. The technology targets a major challenge in superconducting quantum computers: controlling growing numbers of qubits without relying on bulky, power-intensive room-temperature electronics and extensive wiring.
"Today's efforts in scaling cryogenic quantum computers have delivered tremendous progress, with several practical use cases already demonstrated. However, further scaling is approaching a hard wall, as it still relies on power-hungry room-temperature electronics and separate wiring for each quantum bit (qubit) — both used to operate the quantum computer and link it to the outside world. The clearest path forward, for superconducting quantum computers in particular, is to bring the classical control and interface hardware down into the cryostat, right next to the quantum chip kept cold to protect its fragile quantum states. The catch is that such integration is extremely demanding in power dissipation, speed, and energy efficiency," says Dr. Heorhii Bohuslavskyi, Co-founder and CEO of S-Transistors. "Superconducting transistors are exactly that missing piece of hardware for large-scale, energy-efficient quantum computing."
Superconducting Transistor Technology
S-Transistors combines transistor functionality with superconducting properties to enable high-speed computing with extremely low power consumption at cryogenic temperatures. The technology could support control electronics positioned closer to quantum processors, improving scalability while limiting heat generation.
“When you think about it, the transistor is the most mass-manufactured device in human history. By combining the transistor functionality, with its unparalleled computing potential, and the superconducting property of near-zero power dissipation in a single device, we can reach a completely new level of energy-efficient cryogenic computing. In the near term, this already solves the cryogenic signal routing and delivery problems the superconducting quantum computer, but the real vision is the quantum motherboard: a completely new platform for scaling quantum computers, operating at mK temperatures, and controlling the operation of qubit-based QPU," says Dr. Andrey Generalov, Co-founder and CTO of S-Transistors.
From Prototype to Commercialisation
The first product, a superconducting-transistor-based multiplexer, is designed for existing cryogenic systems and is expected to reach early customers and strategic partners during the startup’s first year. Longer-term applications could extend into classical computing, AI and high-performance computing hardware, spacecraft electronics and particle detectors.
“S-Transistors is one of those rare companies built around a genuinely new piece of fundamental technology that could become an enabling layer for an entire industry. As quantum computers scale from hundreds or thousands of qubits toward commercially useful machines, we believe superconducting transistors can become a critical part of the hardware stack that makes that scaling possible,” says Jyri Engeström, Partner at Lifeline Ventures.
"Our strategy at VTT is to shorten the journey from idea to pilot, from pilot to commercial solution. We will continue to be a part of S-Transistors’ journey as the company approaches the manufacturing phase. S-Transistors’ superconducting transistor technology will allow us to reach the point where quantum computers finally provide real-world value,” says Erja Turunen, Executive Vice President at VTT.