ESPOO, Finland -- September 01, 2026 -- S-Transistors, a startup spun out of VTT Technical Research Centre of Finland, has raised €2.6 million in pre-seed funding to commercialize a new class of superconducting transistors for controlling large-scale quantum computers. Lifeline Ventures led the round, joined by an angel investor, the company announced on Aug. 31, 2026. The capital will fund prototype development for cryogenic signal control, a dedicated cryogenic laboratory, and a manufacturing pilot line for the company's superconducting integrated circuits.
Cable Bottlenecks Cap Today's Quantum Processors
Cryogenically cooled superconducting quantum computers currently rely on multiple bulky, expensive cables per qubit, running from the processor inside the cryostat out to room-temperature electronics. That wiring architecture caps how many qubits a machine can practically control, according to S-Transistors. Moving classical control and interface hardware into the cryostat next to the quantum chip is described as the clearer path forward, but conventional silicon transistors struggle to combine the speed needed to control large qubit counts with the ultra-low power dissipation required to avoid disrupting the cold environment.
Superconducting Transistors Pair Computing Power With Near-Zero Heat Loss
S-Transistors' devices combine standard transistor switching function with the near-zero power dissipation of superconductors, a property that lets electronics sit directly beside fragile quantum chips without generating disruptive heat. Dr. Heorhii Bohuslavskyi, co-founder and CEO of S-Transistors, said superconducting transistors fill the missing hardware gap for large-scale, energy-efficient quantum computing, since integrating classical control electronics into the cryostat is demanding in power dissipation, speed, and energy efficiency. The company's fabrication process is already available at wafer scale.
Multiplexer Product Ships To Early Customers Within A Year
S-Transistors' first commercial product is a superconducting-transistor-based multiplexer designed to plug into existing cryogenic setups and speed up prototyping of quantum devices. The company plans to ship the multiplexer to early customers and strategic partners within its first year of operation. Prospective customers and collaborators have flagged the multiplexer as addressing one of the most acute pain points in scaling today's superconducting quantum computers, the company said.
Backers Frame Chip As Enabling Layer For A Wider Hardware Stack
Dr. Andrey Generalov, co-founder and CTO of S-Transistors, said combining transistor computing potential with superconducting near-zero power dissipation opens a new level of energy-efficient cryogenic computing, with the longer-term goal of a "quantum motherboard" operating at millikelvin temperatures to control qubit-based processors. Jyri Engeström, partner at Lifeline Ventures, said superconducting transistors can become a critical part of the hardware stack that makes that scaling possible. Erja Turunen, Executive Vice President at VTT, said the institute will continue supporting S-Transistors as the company moves toward its manufacturing phase.
Superconducting transistor technology, first theorized in the 1980s, also has potential applications in classical computing, artificial intelligence and high-performance computing hardware, spacecraft electronics, and particle detectors, according to S-Transistors.