Finnish startup S-Transistors raises €2.6 million pre-seed to develop superconducting electronics for quantum computing

Finnish startup S-Transistors has raised €2.6 million in pre-seed funding in a round led by Lifeline Ventures, with participation from an angel investor. Spun out of VTT Technical Research Centre of Finland, the company is developing superconducting transistor-based integrated circuits aimed initially at addressing the control and signal-routing challenges of cryogenic quantum computers. Its technology is designed to reduce the power consumption and physical footprint of electronics used to operate quantum processors, where conventional room-temperature electronics and extensive cabling can create scaling constraints. S-Transistors plans to use the funding to develop cryogenic signal-control prototypes, establish a cryogenic laboratory, set up a pilot manufacturing line and expand its team. The company’s first product is a superconducting-transistor-based multiplexer, which it plans to deliver to early customers and strategic partners during its first year.

Today’s cryogenically cooled superconducting quantum computers need a paradigm-changing solution to break the scaling limit of the quantum processing unit (QPU) — the array of quantum bits that, by analogy to a conventional CPU, does the quantum computing. That limit comes from the power-hungry, poorly scalable way quantum processors are controlled today: multiple expensive, bulky cables per qubit, running from the processor inside the cryostat out to room-temperature electronics. This is exactly where S-Transistors’ superconducting transistor technology, which is already available at wafer scale, offers a solution that is radically more energy-efficient and compact than existing alternatives.