SemiQon's Technology

At SemiQon, we want to use our technological expertise to eliminate bottle necks that are slowing  down manufacturability and see the promise of quantum realized. Our scalable quantum processing  units for quantum computing use semiconductor quantum-dot qubits and cryogenic ultra-low dissipation CMOS hardware.

Our technology expands upon VTT’s ground-breaking demonstration of monolithically integrated on chip quasi-dissipationless cryogenic multiplexers based on proprietary CMOS technology and devices with extremely low noise levels.

The ultra-low-charge-noise background of quantum-dot devices at relatively higher temperatures, above 1 K, was demonstrated and serve as the foundation for SemiQon’s objectives. This demonstration was done using the same process to fabricate qubits and CMOS circuits on the same chip.

The requirement of operating Si QD-based spin qubits at temperatures of about a few kelvins and  below to preserve fragile quantum information encoded into spins prevents using the room  temperature high-throughput probe station. Cryogenic probe stations are unlikely to ever reach the  maturity level requires to demonstrate qubit operation beyond I-V measurements. Thus, cryogenic on-chip multiplexing appears to be the only viable candidate for the development, optimization, and scaling up of silicon quantum processors based on large-scale statistical analysis from nominally identical silicon spin qubit devices.

The most promising way to realize cryogenic multiplexing, control, and/or readout of qubits is cryogenic CMOS electronics (cryo-CMOS). Using the same process to fabricate both qubits and CMOS circuits on the same chip, the ultra-low-charge noise background (limiting spin qubit  performance due to spin-orbit coupling) of QD qubit devices at high temperatures above 1 K was demonstrated.

We aim to extend cryogenic multiplexers to accommodate hundreds of spin qubit devices on few mm2 silicon chip and apply recently developed machine-learning algorithms to allow for automated extraction of electrostatic and spin coherence properties of qubit arrays within the same cooldown.

We work out of Micronova, an advanced research facility for nano- and microtechnology located in Espoo Finland. Our access to Micronova’s pilot-line fab makes us exceptionally nimble and allows us to benefit from fast design and fabrication cycles.