S-Transistors, a Finnish startup originating from VTT Technical Research Centre of Finland, secured €2.6 million in pre-seed funding to develop superconducting transistors for controlling quantum computers. The company is building quantum motherboards designed to provide energy- and cost-efficient orchestration of cryogenic quantum computers at scale, addressing a critical limitation in current technology. “Today’s efforts in scaling cryogenic quantum computers have delivered tremendous progress,” says Dr. Heorhii Bohuslavskyi, Co-founder and CEO of S-Transistors.
“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.” These novel devices combine transistor computational power with the ultra-low power dissipation of superconductors.
Superconducting Transistors Address Quantum Computer Scaling Limits
The €2.6 million investment will support the development of these novel devices, which aim to bridge the gap between computational power and energy efficiency, a critical challenge as quantum processors grow in complexity. S-Transistors is specifically building quantum motherboards intended to orchestrate cryogenic quantum computers at a larger scale than currently possible. The core innovation lies in combining transistor functionality with the ultra-low power dissipation inherent in superconductors; this approach directly addresses the escalating power demands and unwieldy cabling currently hindering quantum computer scalability.
Existing cryogenic quantum computers rely on numerous, bulky cables connecting the processor within the cryostat to room-temperature electronics, creating both engineering and energy consumption hurdles. S-Transistors’ technology offers a more compact and energy-efficient alternative, initially manifested as a superconducting-transistor-based multiplexer slated for release to early customers within the next year.
This multiplexer is designed to accelerate the development and prototyping of quantum devices, tackling a significant bottleneck in current superconducting quantum computer scaling. The company’s long-term vision extends beyond immediate improvements in signal routing; they aim to create a complete quantum motherboard operating at extremely low temperatures.
“When you think about it, the transistor is the most mass-manufactured device in human history,” says Dr. Andrey Generalov, Co-founder and CTO of S-Transistors. “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.” This platform, they believe, will be essential for controlling qubit-based quantum processing units and ultimately unlocking the potential of quantum computers with hundreds of thousands of qubits.
Dr. Heorhii Bohuslavskyi, Co-founder and CEO of S-Transistors, says that superconducting transistors are “exactly that missing piece of hardware for large-scale, energy-efficient quantum computing.” Lifeline Ventures, leading the funding round, echoes this sentiment, stating that S-Transistors has developed “a genuinely new piece of fundamental technology that could become an enabling layer for an entire industry.” VTT Technical Research Centre of Finland intends to continue supporting S-Transistors as the company moves toward manufacturing, believing the technology will be crucial in delivering real-world value from quantum computers.
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.
Jyri Engeström, Partner at Lifeline Ventures
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